3957640040 has 32 divisors (see below), whose sum is σ = 8974817280. Its totient is φ = 1570588992.

The previous prime is 3957640033. The next prime is 3957640081. The reversal of 3957640040 is 400467593.

It is a super-2 number, since 2×3957640040² = 31325829372422403200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3957639976 and 3957640003.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 384452 + ... + 394611.

It is an arithmetic number, because the mean of its divisors is an integer number (280463040).

Almost surely, 2^3957640040 is an apocalyptic number.

It is an amenable number.

3957640040 is an abundant number, since it is smaller than the sum of its proper divisors (5017177240).

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

3957640040 is a wasteful number, since it uses less digits than its factorization.

3957640040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779201 (or 779197 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 3957640040 is about 62909.7769825963. The cubic root of 3957640040 is about 1581.7776339350. Note that the first 3 decimals are identical.

The spelling of 3957640040 in words is "three billion, nine hundred fifty-seven million, six hundred forty thousand, forty".