Numbers 30,000,000s

A page of the Numeropedia - the Special Encyclopedia of Numbers

30,000,000 31,000,00032,000,00033,000,00034,000,000

35,000,00036,000,00037,000,00038,000,00039,000,000

All Numbers  & [1M] & [10M- [20M] - [30M] - [40M] - [50M] - [60M] - [70M] - [80M] - [90M]  &  [100M]

1  - 10 - 100  - 1000 - 10,000 - 100,000 - 1M - 10M - 100M1B10B - 100B - 1T - 10T - 100T - 1Q ...

30,000,000

[Tech.]  Frequency Ranges. 

Range

Names

Uses

3 Hz -

300 Hz

Extremely Low Frequency (ELF)

Telegraph

300 Hz -

3 KHz

Voice Frequency (VF)

Telephone Circuitry

3 KHz -

30 KHz

Very Low Frequency (VLF)

High Fidelity

30 KHz- 300 KHz

Low Frequency (LF)

Maritime Mobile

300 KHz -

3 MHz

Medium Frequency (MF)

Navigational Radio, Land-maritime Mobile

3 MHz -

30 MHz

High Frequency (HF)

Maritime, Aeronautical, Amateur Radio

30 MHz -

300 MHz

Very High Frequency (VHF)

Maritime, Meteorological Communication, Television

300MHz -

3 GHz

Ultra High Frequency (UHF)

Television, Military, Low Range Radar

3 GHz -

30 GHz

Super High Frequency (SHF)

Space, Satellite, Microwave

30 GHz -

300 GHz

Extremely High Frequency (EHF)

Radio Astronomy

 

30,395,276

[Math.]  A pair of amicable numbers (24472180, 30395276).

 

30,402,457 

[Math.]  A prime number. A Mersenne exponent: 230402457–1 is the 43rd Mersenne prime number.

 

30,724,694

[Math.]  A pair of amicable numbers (30724694, 32174506).

 

30,830,696

[Math.]  A pair of amicable numbers (30830696, 31652704).

 

30,969,225

[Math.]  Sum of the first 105 cube numbers:

13+23+…+1043+1053 = 30,969,225 = (1+2+…+104+105)2 = 55652.

 

xy,abc,def

[Math.]  For any xy = 10 to 99, there are always six 6-digit numbers abc,edf such that the sum (xy+abc,def) is equal to one of 6 digit-rotations of 142,857 and the number xy,abc,def is a multiple of 142,857.

 

For any xy = 10 to 99, there are always twelve 6-digit numbers abc,edf such that the sum (xy+abc,def) is equal to one of 12 digit-rotations of 076,923 or 153,846 and the number xy,abc,def is a multiple of 76,923.