18073931 has 6 divisors (see below), whose sum is σ = 18719532. Its totient is φ = 17449880.

The previous prime is 18073919. The next prime is 18073933. The reversal of 18073931 is 13937081.

It is not a de Polignac number, because 18073931 - 2¹⁴ = 18057547 is a prime.

It is a super-2 number, since 2×18073931² = 653333963585522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18073933) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9905 + ... + 11586.

It is an arithmetic number, because the mean of its divisors is an integer number (3119922).

Almost surely, 2^18073931 is an apocalyptic number.

18073931 is a deficient number, since it is larger than the sum of its proper divisors (645601).

18073931 is an equidigital number, since it uses as much as digits as its factorization.

18073931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21549 (or 21520 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 18073931 is about 4251.3446108261. The cubic root of 18073931 is about 262.4324530662.

The spelling of 18073931 in words is "eighteen million, seventy-three thousand, nine hundred thirty-one".