18636489 has 9 divisors (see below), whose sum is σ = 26938093. Its totient is φ = 12415692.

The previous prime is 18636481. The next prime is 18636517. The reversal of 18636489 is 98463681.

The square root of 18636489 is 4317.

It is a perfect power (a square), and thus also a powerful number.

18636489 is a `hidden beast` number, since 1 + 8 + 636 + 4 + 8 + 9 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 18636489 - 2³ = 18636481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18636481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 12232 + ... + 13670.

Almost surely, 2^18636489 is an apocalyptic number.

18636489 is the 4317-th square number.

18636489 is the 2159-th centered octagonal number.

It is an amenable number.

18636489 is a deficient number, since it is larger than the sum of its proper divisors (8301604).

18636489 is an frugal number, since it uses more digits than its factorization.

18636489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2884 (or 1442 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The cubic root of 18636489 is about 265.1274526347.

The spelling of 18636489 in words is "eighteen million, six hundred thirty-six thousand, four hundred eighty-nine".