18989456 has 10 divisors (see below), whose sum is σ = 36792102. Its totient is φ = 9494720.

The previous prime is 18989441. The next prime is 18989471. The reversal of 18989456 is 65498981.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18989441) and next prime (18989471).

It can be written as a sum of positive squares in only one way, i.e., 16679056 + 2310400 = 4084^2 + 1520^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 593405 + ... + 593436.

Almost surely, 2^18989456 is an apocalyptic number.

18989456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18989456 is a deficient number, since it is larger than the sum of its proper divisors (17802646).

18989456 is a wasteful number, since it uses less digits than its factorization.

18989456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1186849 (or 1186843 counting only the distinct ones).

The product of its digits is 622080, while the sum is 50.

The square root of 18989456 is about 4357.6892959457. The cubic root of 18989456 is about 266.7907949894.

The spelling of 18989456 in words is "eighteen million, nine hundred eighty-nine thousand, four hundred fifty-six".