18039970 has 32 divisors (see below), whose sum is σ = 35239680. Its totient is φ = 6609600.

The previous prime is 18039961. The next prime is 18039997. The reversal of 18039970 is 7993081.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19171 + ... + 20089.

It is an arithmetic number, because the mean of its divisors is an integer number (1101240).

Almost surely, 2^18039970 is an apocalyptic number.

18039970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18039970 is a deficient number, since it is larger than the sum of its proper divisors (17199710).

18039970 is a wasteful number, since it uses less digits than its factorization.

18039970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 18039970 is about 4247.3485847055. The cubic root of 18039970 is about 262.2679794095.

The spelling of 18039970 in words is "eighteen million, thirty-nine thousand, nine hundred seventy".