977440621 has 16 divisors (see below), whose sum is σ = 1024084800. Its totient is φ = 931730688.

The previous prime is 977440603. The next prime is 977440663. The reversal of 977440621 is 126044779.

It is a cyclic number.

It is not a de Polignac number, because 977440621 - 2⁵ = 977440589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (977440601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1241590 + ... + 1242376.

It is an arithmetic number, because the mean of its divisors is an integer number (64005300).

Almost surely, 2^977440621 is an apocalyptic number.

It is an amenable number.

977440621 is a deficient number, since it is larger than the sum of its proper divisors (46644179).

977440621 is a wasteful number, since it uses less digits than its factorization.

977440621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 977440621 is about 31264.0467790080. The cubic root of 977440621 is about 992.4229401686.

The spelling of 977440621 in words is "nine hundred seventy-seven million, four hundred forty thousand, six hundred twenty-one".