18000931 has 8 divisors (see below), whose sum is σ = 19568304. Its totient is φ = 16459680.

The previous prime is 18000919. The next prime is 18000937. The reversal of 18000931 is 13900081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18000931 - 2⁷ = 18000803 is a prime.

It is a super-2 number, since 2×18000931² = 648067033733522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18000937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5080 + ... + 7861.

It is an arithmetic number, because the mean of its divisors is an integer number (2446038).

Almost surely, 2^18000931 is an apocalyptic number.

18000931 is a deficient number, since it is larger than the sum of its proper divisors (1567373).

18000931 is a wasteful number, since it uses less digits than its factorization.

18000931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13061.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 18000931 is about 4242.7504051028. The cubic root of 18000931 is about 262.0786576953.

The spelling of 18000931 in words is "eighteen million, nine hundred thirty-one", and thus it is an aban number.