18989450 has 24 divisors (see below), whose sum is σ = 35435232. Its totient is φ = 7571120.

The previous prime is 18989441. The next prime is 18989471. The reversal of 18989450 is 5498981.

It is a super-2 number, since 2×18989450² = 721198422605000, which contains 22 as substring.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29027 + ... + 29673.

It is an arithmetic number, because the mean of its divisors is an integer number (1476468).

Almost surely, 2^18989450 is an apocalyptic number.

18989450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18989450 is a deficient number, since it is larger than the sum of its proper divisors (16445782).

18989450 is a wasteful number, since it uses less digits than its factorization.

18989450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1246 (or 1241 counting only the distinct ones).

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

The square root of 18989450 is about 4357.6886075074. The cubic root of 18989450 is about 266.7907668906.

The spelling of 18989450 in words is "eighteen million, nine hundred eighty-nine thousand, four hundred fifty".