18998532 has 36 divisors (see below), whose sum is σ = 54885376. Its totient is φ = 5428080.

The previous prime is 18998519. The next prime is 18998533. The reversal of 18998532 is 23589981.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (18998533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37444 + ... + 37947.

Almost surely, 2^18998532 is an apocalyptic number.

18998532 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18998532 is an abundant number, since it is smaller than the sum of its proper divisors (35886844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18998532 is a wasteful number, since it uses less digits than its factorization.

18998532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75408 (or 75403 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 18998532 is about 4358.7305491393. The cubic root of 18998532 is about 266.8332923906.

The spelling of 18998532 in words is "eighteen million, nine hundred ninety-eight thousand, five hundred thirty-two".