18749988 has 48 divisors (see below), whose sum is σ = 49000000. Its totient is φ = 6200064.

The previous prime is 18749959. The next prime is 18749993. The reversal of 18749988 is 88994781.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14388 + ... + 15636.

Almost surely, 2^18749988 is an apocalyptic number.

18749988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18749988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24500000).

18749988 is an abundant number, since it is smaller than the sum of its proper divisors (30250012).

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

18749988 is a wasteful number, since it uses less digits than its factorization.

18749988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1401 (or 1393 counting only the distinct ones).

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

The square root of 18749988 is about 4330.1256332813. The cubic root of 18749988 is about 265.6645856205.

The spelling of 18749988 in words is "eighteen million, seven hundred forty-nine thousand, nine hundred eighty-eight".