18000990 has 48 divisors (see below), whose sum is σ = 53490528. Its totient is φ = 4114368.

The previous prime is 18000989. The next prime is 18001031. The reversal of 18000990 is 9900081.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13657 + ... + 14916.

It is an arithmetic number, because the mean of its divisors is an integer number (1114386).

Almost surely, 2^18000990 is an apocalyptic number.

18000990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18000990 is an abundant number, since it is smaller than the sum of its proper divisors (35489538).

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

18000990 is a wasteful number, since it uses less digits than its factorization.

18000990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28593 (or 28590 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 18000990 is about 4242.7573581340. The cubic root of 18000990 is about 262.0789440254.

The spelling of 18000990 in words is "eighteen million, nine hundred ninety", and thus it is an aban number.