18173090 has 32 divisors (see below), whose sum is σ = 36058176. Its totient is φ = 6552000.

The previous prime is 18173041. The next prime is 18173137. The reversal of 18173090 is 9037181.

It is a super-2 number, since 2×18173090² = 660522400296200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (29) 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, 3965 + ... + 7215.

It is an arithmetic number, because the mean of its divisors is an integer number (1126818).

Almost surely, 2^18173090 is an apocalyptic number.

18173090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18173090 is a deficient number, since it is larger than the sum of its proper divisors (17885086).

18173090 is a wasteful number, since it uses less digits than its factorization.

18173090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3314.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 18173090 is about 4262.9907342147. The cubic root of 18173090 is about 262.9115057412.

The spelling of 18173090 in words is "eighteen million, one hundred seventy-three thousand, ninety".