18899240 has 32 divisors (see below), whose sum is σ = 45026280. Its totient is φ = 7114752.

The previous prime is 18899233. The next prime is 18899263. The reversal of 18899240 is 4299881.

It can be written as a sum of positive squares in 4 ways, for example, as 12376324 + 6522916 = 3518^2 + 2554^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13217 + ... + 14576.

Almost surely, 2^18899240 is an apocalyptic number.

18899240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18899240 is an abundant number, since it is smaller than the sum of its proper divisors (26127040).

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

18899240 is a wasteful number, since it uses less digits than its factorization.

18899240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27821 (or 27817 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 18899240 is about 4347.3256146739. The cubic root of 18899240 is about 266.3676300673.

The spelling of 18899240 in words is "eighteen million, eight hundred ninety-nine thousand, two hundred forty".