3947897031 has 32 divisors (see below), whose sum is σ = 6015582720. Its totient is φ = 2284427904.

The previous prime is 3947897021. The next prime is 3947897053. The reversal of 3947897031 is 1307987493.

It is not a de Polignac number, because 3947897031 - 2⁵ = 3947896999 is a prime.

It is a super-2 number, since 2×3947897031² = 31171781934757229922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3947897021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15625 + ... + 90221.

It is an arithmetic number, because the mean of its divisors is an integer number (187986960).

Almost surely, 2^3947897031 is an apocalyptic number.

3947897031 is a deficient number, since it is larger than the sum of its proper divisors (2067685689).

3947897031 is a wasteful number, since it uses less digits than its factorization.

3947897031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74695.

The product of its (nonzero) digits is 1143072, while the sum is 51.

The square root of 3947897031 is about 62832.2928994319. The cubic root of 3947897031 is about 1580.4785484951.

The spelling of 3947897031 in words is "three billion, nine hundred forty-seven million, eight hundred ninety-seven thousand, thirty-one".