18875990 has 32 divisors (see below), whose sum is σ = 39783744. Its totient is φ = 6312960.

The previous prime is 18875971. The next prime is 18876007. The reversal of 18875990 is 9957881.

18875990 = T₉₃₉ + T₉₄₀ + ... + T₉₇₉.

It is a happy number.

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, 419 + ... + 6158.

It is an arithmetic number, because the mean of its divisors is an integer number (1243242).

Almost surely, 2^18875990 is an apocalyptic number.

18875990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18875990 is an abundant number, since it is smaller than the sum of its proper divisors (20907754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18875990 is a wasteful number, since it uses less digits than its factorization.

18875990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6632.

The product of its (nonzero) digits is 181440, while the sum is 47.

The square root of 18875990 is about 4344.6507339486. The cubic root of 18875990 is about 266.2583560310.

The spelling of 18875990 in words is "eighteen million, eight hundred seventy-five thousand, nine hundred ninety".