872491923 has 12 divisors (see below), whose sum is σ = 1260522120. Its totient is φ = 581543136.

The previous prime is 872491909. The next prime is 872491927. The reversal of 872491923 is 329194278.

872491923 is a `hidden beast` number, since 8 + 72 + 491 + 92 + 3 = 666.

It is not a de Polignac number, because 872491923 - 2¹⁸ = 872229779 is a prime.

It is a super-2 number, since 2×872491923² = 1522484311400475858, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (872491927) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83568 + ... + 93426.

It is an arithmetic number, because the mean of its divisors is an integer number (105043510).

Almost surely, 2^872491923 is an apocalyptic number.

872491923 is a deficient number, since it is larger than the sum of its proper divisors (388030197).

872491923 is a wasteful number, since it uses less digits than its factorization.

872491923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19698 (or 19695 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 872491923 is about 29537.9742534927. The cubic root of 872491923 is about 955.5508542259.

The spelling of 872491923 in words is "eight hundred seventy-two million, four hundred ninety-one thousand, nine hundred twenty-three".