18468931 has 16 divisors (see below), whose sum is σ = 21853440. Its totient is φ = 15444000.

The previous prime is 18468917. The next prime is 18468941. The reversal of 18468931 is 13986481.

18468931 = 611² + 612² + ... + 656².

It is not a de Polignac number, because 18468931 - 2⁵ = 18468899 is a prime.

It is a super-2 number, since 2×18468931² = 682202824565522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18468941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4056 + ... + 7306.

It is an arithmetic number, because the mean of its divisors is an integer number (1365840).

Almost surely, 2^18468931 is an apocalyptic number.

18468931 is a deficient number, since it is larger than the sum of its proper divisors (3384509).

18468931 is a wasteful number, since it uses less digits than its factorization.

18468931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3306.

The product of its digits is 41472, while the sum is 40.

The square root of 18468931 is about 4297.5494179823. The cubic root of 18468931 is about 264.3304850654.

The spelling of 18468931 in words is "eighteen million, four hundred sixty-eight thousand, nine hundred thirty-one".