18904131 has 16 divisors (see below), whose sum is σ = 28483200. Its totient is φ = 12388104.

The previous prime is 18904111. The next prime is 18904159. The reversal of 18904131 is 13140981.

It is not a de Polignac number, because 18904131 - 2¹¹ = 18902083 is a prime.

It is a super-2 number, since 2×18904131² = 714732337730322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 18904095 and 18904104.

It is not an unprimeable number, because it can be changed into a prime (18904111) 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, 4341 + ... + 7526.

It is an arithmetic number, because the mean of its divisors is an integer number (1780200).

Almost surely, 2^18904131 is an apocalyptic number.

18904131 is a deficient number, since it is larger than the sum of its proper divisors (9579069).

18904131 is a wasteful number, since it uses less digits than its factorization.

18904131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11935 (or 11929 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 18904131 is about 4347.8881080359. Note that the first 3 decimals coincide. The cubic root of 18904131 is about 266.3906061536.

The spelling of 18904131 in words is "eighteen million, nine hundred four thousand, one hundred thirty-one".