18993190 has 16 divisors (see below), whose sum is σ = 34237728. Its totient is φ = 7586176.

The previous prime is 18993181. The next prime is 18993203. The reversal of 18993190 is 9139981.

It is a super-2 number, since 2×18993190² = 721482532752200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11454 + ... + 13006.

It is an arithmetic number, because the mean of its divisors is an integer number (2139858).

Almost surely, 2^18993190 is an apocalyptic number.

18993190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18993190 is a deficient number, since it is larger than the sum of its proper divisors (15244538).

18993190 is a wasteful number, since it uses less digits than its factorization.

18993190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2783.

The product of its (nonzero) digits is 17496, while the sum is 40.

The square root of 18993190 is about 4358.1177129582. The cubic root of 18993190 is about 266.8082806850.

The spelling of 18993190 in words is "eighteen million, nine hundred ninety-three thousand, one hundred ninety".