864521940 has 48 divisors (see below), whose sum is σ = 2431554048. Its totient is φ = 229501824.

The previous prime is 864521899. The next prime is 864522007. The reversal of 864521940 is 49125468.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18927 + ... + 45686.

It is an arithmetic number, because the mean of its divisors is an integer number (50657376).

Almost surely, 2^864521940 is an apocalyptic number.

It is an amenable number.

864521940 is an abundant number, since it is smaller than the sum of its proper divisors (1567032108).

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

864521940 is a wasteful number, since it uses less digits than its factorization.

864521940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64848 (or 64846 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 864521940 is about 29402.7539526487. The cubic root of 864521940 is about 952.6323814874.

The spelling of 864521940 in words is "eight hundred sixty-four million, five hundred twenty-one thousand, nine hundred forty".