18812988 has 36 divisors (see below), whose sum is σ = 49624848. Its totient is φ = 5998080.

The previous prime is 18812987. The next prime is 18812993. The reversal of 18812988 is 88921881.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18812987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10533 + ... + 12188.

It is an arithmetic number, because the mean of its divisors is an integer number (1378468).

Almost surely, 2^18812988 is an apocalyptic number.

18812988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18812988 is an abundant number, since it is smaller than the sum of its proper divisors (30811860).

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

18812988 is a wasteful number, since it uses less digits than its factorization.

18812988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22754 (or 22749 counting only the distinct ones).

The product of its digits is 73728, while the sum is 45.

The square root of 18812988 is about 4337.3941485643. The cubic root of 18812988 is about 265.9617975174.

The spelling of 18812988 in words is "eighteen million, eight hundred twelve thousand, nine hundred eighty-eight".