77339939 has 2 divisors, whose sum is σ = 77339940. Its totient is φ = 77339938.

The previous prime is 77339917. The next prime is 77339959. The reversal of 77339939 is 93993377.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77339939 is a prime.

It is not a weakly prime, because it can be changed into another prime (77339959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38669969 + 38669970.

It is an arithmetic number, because the mean of its divisors is an integer number (38669970).

Almost surely, 2^77339939 is an apocalyptic number.

77339939 is a deficient number, since it is larger than the sum of its proper divisors (1).

77339939 is an equidigital number, since it uses as much as digits as its factorization.

77339939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 964467, while the sum is 50.

The square root of 77339939 is about 8794.3128782185. The cubic root of 77339939 is about 426.0572322028.

The spelling of 77339939 in words is "seventy-seven million, three hundred thirty-nine thousand, nine hundred thirty-nine".