18992988 has 144 divisors (see below), whose sum is σ = 59435040. Its totient is φ = 5225472.

The previous prime is 18992903. The next prime is 18992993. The reversal of 18992988 is 88929981.

It is a happy number.

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

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 47 ways as a sum of consecutive naturals, for example, 195756 + ... + 195852.

Almost surely, 2^18992988 is an apocalyptic number.

18992988 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 18992988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29717520).

18992988 is an abundant number, since it is smaller than the sum of its proper divisors (40442052).

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

18992988 is a wasteful number, since it uses less digits than its factorization.

18992988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 146 counting only the distinct ones).

The product of its digits is 746496, while the sum is 54.

The square root of 18992988 is about 4358.0945377539. The cubic root of 18992988 is about 266.8073348115.

The spelling of 18992988 in words is "eighteen million, nine hundred ninety-two thousand, nine hundred eighty-eight".