977997393 has 72 divisors (see below), whose sum is σ = 1590900480. Its totient is φ = 576538560.

The previous prime is 977997373. The next prime is 977997401. The reversal of 977997393 is 393799779.

977997393 is a `hidden beast` number, since 97 + 79 + 97 + 393 = 666.

It is not a de Polignac number, because 977997393 - 2²⁴ = 961220177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 977997393.

It is not an unprimeable number, because it can be changed into a prime (977997353) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 16576198 + ... + 16576256.

It is an arithmetic number, because the mean of its divisors is an integer number (22095840).

Almost surely, 2^977997393 is an apocalyptic number.

977997393 is a gapful number since it is divisible by the number (93) formed by its first and last digit.

It is an amenable number.

977997393 is a deficient number, since it is larger than the sum of its proper divisors (612903087).

977997393 is a wasteful number, since it uses less digits than its factorization.

977997393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227 (or 165 counting only the distinct ones).

The product of its digits is 20253807, while the sum is 63.

The square root of 977997393 is about 31272.9498608622. The cubic root of 977997393 is about 992.6113398221.

The spelling of 977997393 in words is "nine hundred seventy-seven million, nine hundred ninety-seven thousand, three hundred ninety-three".