18890790 has 48 divisors (see below), whose sum is σ = 46621008. Its totient is φ = 4897152.

The previous prime is 18890783. The next prime is 18890801. The reversal of 18890790 is 9709881.

It is a Curzon number.

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, 173256 + ... + 173364.

It is an arithmetic number, because the mean of its divisors is an integer number (971271).

Almost surely, 2^18890790 is an apocalyptic number.

18890790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18890790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23310504).

18890790 is an abundant number, since it is smaller than the sum of its proper divisors (27730218).

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

18890790 is a wasteful number, since it uses less digits than its factorization.

18890790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281 (or 172 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 18890790 is about 4346.3536441482. The cubic root of 18890790 is about 266.3279257898.

The spelling of 18890790 in words is "eighteen million, eight hundred ninety thousand, seven hundred ninety".