18998450 has 24 divisors (see below), whose sum is σ = 35922180. Its totient is φ = 7473600.

The previous prime is 18998411. The next prime is 18998471. The reversal of 18998450 is 5489981.

It can be written as a sum of positive squares in 6 ways, for example, as 2163841 + 16834609 = 1471^2 + 4103^2 .

It is a super-2 number, since 2×18998450² = 721882204805000, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65 + ... + 6164.

Almost surely, 2^18998450 is an apocalyptic number.

18998450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18998450 is a deficient number, since it is larger than the sum of its proper divisors (16923730).

18998450 is a wasteful number, since it uses less digits than its factorization.

18998450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6302 (or 6297 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 18998450 is about 4358.7211427206. The cubic root of 18998450 is about 266.8329084949.

The spelling of 18998450 in words is "eighteen million, nine hundred ninety-eight thousand, four hundred fifty".