3977477636 has 18 divisors (see below), whose sum is σ = 7650892830. Its totient is φ = 1807944160.

The previous prime is 3977477627. The next prime is 3977477659. The reversal of 3977477636 is 6367747793.

It is a happy number.

3977477636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 3917508100 + 59969536 = 62590^2 + 7744^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4108481 + ... + 4109448.

Almost surely, 2^3977477636 is an apocalyptic number.

It is an amenable number.

3977477636 is a deficient number, since it is larger than the sum of its proper divisors (3673415194).

3977477636 is a wasteful number, since it uses less digits than its factorization.

3977477636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8217955 (or 8217942 counting only the distinct ones).

The product of its digits is 28005264, while the sum is 59.

The square root of 3977477636 is about 63067.2469353150. The cubic root of 3977477636 is about 1584.4161072454.

The spelling of 3977477636 in words is "three billion, nine hundred seventy-seven million, four hundred seventy-seven thousand, six hundred thirty-six".