77120399 has 2 divisors, whose sum is σ = 77120400. Its totient is φ = 77120398.

The previous prime is 77120389. The next prime is 77120419. The reversal of 77120399 is 99302177.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77120399 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77120359) 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, 38560199 + 38560200.

It is an arithmetic number, because the mean of its divisors is an integer number (38560200).

Almost surely, 2^77120399 is an apocalyptic number.

77120399 is a deficient number, since it is larger than the sum of its proper divisors (1).

77120399 is an equidigital number, since it uses as much as digits as its factorization.

77120399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23814, while the sum is 38.

The square root of 77120399 is about 8781.8220774507. The cubic root of 77120399 is about 425.6537095585.

The spelling of 77120399 in words is "seventy-seven million, one hundred twenty thousand, three hundred ninety-nine".