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127979 is a prime number
BaseRepresentation
bin11111001111101011
320111112222
4133033223
513043404
62424255
71042055
oct371753
9214488
10127979
1188175
126208b
1346337
14348d5
1527dbe
hex1f3eb

127979 has 2 divisors, whose sum is σ = 127980. Its totient is φ = 127978.

The previous prime is 127973. The next prime is 127997. The reversal of 127979 is 979721.

Together with next prime (127997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-127979 is a prime.

It is not a weakly prime, because it can be changed into another prime (127973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63989 + 63990.

It is an arithmetic number, because the mean of its divisors is an integer number (63990).

2127979 is an apocalyptic number.

127979 is a deficient number, since it is larger than the sum of its proper divisors (1).

127979 is an equidigital number, since it uses as much as digits as its factorization.

127979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7938, while the sum is 35.

The square root of 127979 is about 357.7415268039. The cubic root of 127979 is about 50.3940857678.

The spelling of 127979 in words is "one hundred twenty-seven thousand, nine hundred seventy-nine".