18872390 has 16 divisors (see below), whose sum is σ = 34020000. Its totient is φ = 7537920.

The previous prime is 18872317. The next prime is 18872407. The reversal of 18872390 is 9327881.

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, 11735 + ... + 13245.

It is an arithmetic number, because the mean of its divisors is an integer number (2126250).

Almost surely, 2^18872390 is an apocalyptic number.

18872390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18872390 is a deficient number, since it is larger than the sum of its proper divisors (15147610).

18872390 is a wasteful number, since it uses less digits than its factorization.

18872390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2767.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 18872390 is about 4344.2364116148. The cubic root of 18872390 is about 266.2414281590.

The spelling of 18872390 in words is "eighteen million, eight hundred seventy-two thousand, three hundred ninety".