18992290 has 16 divisors (see below), whose sum is σ = 34406712. Its totient is φ = 7547904.

The previous prime is 18992279. The next prime is 18992293. The reversal of 18992290 is 9229981.

It can be written as a sum of positive squares in 4 ways, for example, as 7722841 + 11269449 = 2779^2 + 3357^2 .

It is not an unprimeable number, because it can be changed into a prime (18992293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4479 + ... + 7618.

Almost surely, 2^18992290 is an apocalyptic number.

18992290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18992290 is a deficient number, since it is larger than the sum of its proper divisors (15414422).

18992290 is a wasteful number, since it uses less digits than its factorization.

18992290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12261.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 18992290 is about 4358.0144561486. The cubic root of 18992290 is about 266.8040663456.

The spelling of 18992290 in words is "eighteen million, nine hundred ninety-two thousand, two hundred ninety".