77999399 has 2 divisors, whose sum is σ = 77999400. Its totient is φ = 77999398.

The previous prime is 77999387. The next prime is 77999423. The reversal of 77999399 is 99399977.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77999399 - 2⁸ = 77999143 is a prime.

It is a super-2 number, since 2×77999399² = 12167812488722402, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77999309) 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, 38999699 + 38999700.

It is an arithmetic number, because the mean of its divisors is an integer number (38999700).

Almost surely, 2^77999399 is an apocalyptic number.

77999399 is a deficient number, since it is larger than the sum of its proper divisors (1).

77999399 is an equidigital number, since it uses as much as digits as its factorization.

77999399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8680203, while the sum is 62.

The square root of 77999399 is about 8831.7268413374. The cubic root of 77999399 is about 427.2647707875.

The spelling of 77999399 in words is "seventy-seven million, nine hundred ninety-nine thousand, three hundred ninety-nine".