18995990 has 32 divisors (see below), whose sum is σ = 37618560. Its totient is φ = 6862464.

The previous prime is 18995983. The next prime is 18996001. The reversal of 18995990 is 9959981.

It is a congruent 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, 4556 + ... + 7664.

It is an arithmetic number, because the mean of its divisors is an integer number (1175580).

Almost surely, 2^18995990 is an apocalyptic number.

18995990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18995990 is a deficient number, since it is larger than the sum of its proper divisors (18622570).

18995990 is a wasteful number, since it uses less digits than its factorization.

18995990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3176.

The product of its (nonzero) digits is 262440, while the sum is 50.

The square root of 18995990 is about 4358.4389407218. The cubic root of 18995990 is about 266.8213911117.

The spelling of 18995990 in words is "eighteen million, nine hundred ninety-five thousand, nine hundred ninety".