38640972 has 12 divisors (see below), whose sum is σ = 90162296. Its totient is φ = 12880320.

The previous prime is 38640971. The next prime is 38640991. The reversal of 38640972 is 27904683.

38640972 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 38640972.

It is not an unprimeable number, because it can be changed into a prime (38640971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1610029 + ... + 1610052.

Almost surely, 2^38640972 is an apocalyptic number.

It is an amenable number.

38640972 is an abundant number, since it is smaller than the sum of its proper divisors (51521324).

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

38640972 is a wasteful number, since it uses less digits than its factorization.

38640972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3220088 (or 3220086 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 38640972 is about 6216.1862906448. The cubic root of 38640972 is about 338.0773022077.

The spelling of 38640972 in words is "thirty-eight million, six hundred forty thousand, nine hundred seventy-two".