18799290 has 40 divisors (see below), whose sum is σ = 50551380. Its totient is φ = 5012928.

The previous prime is 18799271. The next prime is 18799327. The reversal of 18799290 is 9299781.

It can be written as a sum of positive squares in 2 ways, for example, as 18740241 + 59049 = 4329^2 + 243^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10795 + ... + 12414.

Almost surely, 2^18799290 is an apocalyptic number.

18799290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18799290 is an abundant number, since it is smaller than the sum of its proper divisors (31752090).

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

18799290 is a wasteful number, since it uses less digits than its factorization.

18799290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23228 (or 23219 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The square root of 18799290 is about 4335.8148023180. The cubic root of 18799290 is about 265.8972316748.

The spelling of 18799290 in words is "eighteen million, seven hundred ninety-nine thousand, two hundred ninety".