18031339 has 8 divisors (see below), whose sum is σ = 19167840. Its totient is φ = 16903296.

The previous prime is 18031309. The next prime is 18031357. The reversal of 18031339 is 93313081.

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 18031339 - 2¹⁹ = 17507051 is a prime.

It is a super-2 number, since 2×18031339² = 650258372265842, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18031309) 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, 2602 + ... + 6544.

It is an arithmetic number, because the mean of its divisors is an integer number (2395980).

Almost surely, 2^18031339 is an apocalyptic number.

18031339 is a deficient number, since it is larger than the sum of its proper divisors (1136501).

18031339 is a wasteful number, since it uses less digits than its factorization.

18031339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4229.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 18031339 is about 4246.3324175104. The cubic root of 18031339 is about 262.2261464496.

The spelling of 18031339 in words is "eighteen million, thirty-one thousand, three hundred thirty-nine".