18008031 has 4 divisors (see below), whose sum is σ = 24010712. Its totient is φ = 12005352.

The previous prime is 18008027. The next prime is 18008033. The reversal of 18008031 is 13080081.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18008031 - 2² = 18008027 is a prime.

It is a super-2 number, since 2×18008031² = 648578360993922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18007989 and 18008007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18008033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3001336 + ... + 3001341.

It is an arithmetic number, because the mean of its divisors is an integer number (6002678).

Almost surely, 2^18008031 is an apocalyptic number.

18008031 is a deficient number, since it is larger than the sum of its proper divisors (6002681).

18008031 is an equidigital number, since it uses as much as digits as its factorization.

18008031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6002680.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 18008031 is about 4243.5870439995. The cubic root of 18008031 is about 262.1131098741.

The spelling of 18008031 in words is "eighteen million, eight thousand, thirty-one".