3957691408 has 20 divisors (see below), whose sum is σ = 8365120848. Its totient is φ = 1798950560.

The previous prime is 3957691403. The next prime is 3957691453. The reversal of 3957691408 is 8041967593.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (3957691403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11243266 + ... + 11243617.

Almost surely, 2^3957691408 is an apocalyptic number.

It is an amenable number.

3957691408 is an abundant number, since it is smaller than the sum of its proper divisors (4407429440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3957691408 is a wasteful number, since it uses less digits than its factorization.

3957691408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22486902 (or 22486896 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 52.

The square root of 3957691408 is about 62910.1852484953. The cubic root of 3957691408 is about 1581.7844774412.

The spelling of 3957691408 in words is "three billion, nine hundred fifty-seven million, six hundred ninety-one thousand, four hundred eight".