3972791522 has 18 divisors (see below), whose sum is σ = 6933204747. Its totient is φ = 1702357524.

The previous prime is 3972791507. The next prime is 3972791527. The reversal of 3972791522 is 2251972793.

It can be written as a sum of positive squares in only one way, i.e., 1986395761 + 1986395761 = 44569^2 + 44569^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=44569.

It is not an unprimeable number, because it can be changed into a prime (3972791527) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 620783 + ... + 627149.

Almost surely, 2^3972791522 is an apocalyptic number.

3972791522 is a deficient number, since it is larger than the sum of its proper divisors (2960413225).

3972791522 is an frugal number, since it uses more digits than its factorization.

3972791522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12750 (or 6376 counting only the distinct ones).

The product of its digits is 476280, while the sum is 47.

The square root of 3972791522 is about 63030.0842614065. The cubic root of 3972791522 is about 1583.7936296396.

The spelling of 3972791522 in words is "three billion, nine hundred seventy-two million, seven hundred ninety-one thousand, five hundred twenty-two".