18989632 has 14 divisors (see below), whose sum is σ = 37682678. Its totient is φ = 9494784.

The previous prime is 18989627. The next prime is 18989669. The reversal of 18989632 is 23698981.

It can be written as a sum of positive squares in only one way, i.e., 18113536 + 876096 = 4256^2 + 936^2 .

It is a super-3 number, since 3×18989632³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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

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 as a sum of consecutive naturals, namely, 148293 + ... + 148420.

Almost surely, 2^18989632 is an apocalyptic number.

It is an amenable number.

18989632 is a deficient number, since it is larger than the sum of its proper divisors (18693046).

18989632 is an equidigital number, since it uses as much as digits as its factorization.

18989632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296725 (or 296715 counting only the distinct ones).

The product of its digits is 186624, while the sum is 46.

The square root of 18989632 is about 4357.7094900877. The cubic root of 18989632 is about 266.7916192194.

The spelling of 18989632 in words is "eighteen million, nine hundred eighty-nine thousand, six hundred thirty-two".