18039131 has 16 divisors (see below), whose sum is σ = 20532960. Its totient is φ = 15697920.

The previous prime is 18039127. The next prime is 18039149. The reversal of 18039131 is 13193081.

It is a cyclic number.

It is not a de Polignac number, because 18039131 - 2² = 18039127 is a prime.

It is a super-2 number, since 2×18039131² = 650820494470322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18039131.

It is not an unprimeable number, because it can be changed into a prime (18039181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61421 + ... + 61713.

It is an arithmetic number, because the mean of its divisors is an integer number (1283310).

Almost surely, 2^18039131 is an apocalyptic number.

18039131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18039131 is a deficient number, since it is larger than the sum of its proper divisors (2493829).

18039131 is a wasteful number, since it uses less digits than its factorization.

18039131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 18039131 is about 4247.2498160574. The cubic root of 18039131 is about 262.2639135076.

The spelling of 18039131 in words is "eighteen million, thirty-nine thousand, one hundred thirty-one".