18998748 has 36 divisors (see below), whose sum is σ = 48707568. Its totient is φ = 6242880.

The previous prime is 18998737. The next prime is 18998773. The reversal of 18998748 is 84789981.

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

It is a junction number, because it is equal to n+sod(n) for n = 18998694 and 18998703.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1161 + ... + 6272.

It is an arithmetic number, because the mean of its divisors is an integer number (1352988).

Almost surely, 2^18998748 is an apocalyptic number.

18998748 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18998748 is an abundant number, since it is smaller than the sum of its proper divisors (29708820).

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

18998748 is a wasteful number, since it uses less digits than its factorization.

18998748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7514 (or 7509 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 54.

The square root of 18998748 is about 4358.7553269253. The cubic root of 18998748 is about 266.8343036226.

The spelling of 18998748 in words is "eighteen million, nine hundred ninety-eight thousand, seven hundred forty-eight".