76857139 has 2 divisors, whose sum is σ = 76857140. Its totient is φ = 76857138.

The previous prime is 76857127. The next prime is 76857149. The reversal of 76857139 is 93175867.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 76857139 - 2⁹ = 76856627 is a prime.

It is not a weakly prime, because it can be changed into another prime (76857149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38428569 + 38428570.

It is an arithmetic number, because the mean of its divisors is an integer number (38428570).

Almost surely, 2^76857139 is an apocalyptic number.

76857139 is a deficient number, since it is larger than the sum of its proper divisors (1).

76857139 is an equidigital number, since it uses as much as digits as its factorization.

76857139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317520, while the sum is 46.

The square root of 76857139 is about 8766.8203471954. The cubic root of 76857139 is about 425.1688169020.

The spelling of 76857139 in words is "seventy-six million, eight hundred fifty-seven thousand, one hundred thirty-nine".