18790840 has 64 divisors (see below), whose sum is σ = 44452800. Its totient is φ = 7139328.

The previous prime is 18790823. The next prime is 18790841. The reversal of 18790840 is 4809781.

It is a self number, because there is not a number n which added to its sum of digits gives 18790840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18790841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112437 + ... + 112603.

It is an arithmetic number, because the mean of its divisors is an integer number (694575).

Almost surely, 2^18790840 is an apocalyptic number.

18790840 is a gapful number since it is divisible by the number (10) 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 18790840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22226400).

18790840 is an abundant number, since it is smaller than the sum of its proper divisors (25661960).

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

18790840 is a wasteful number, since it uses less digits than its factorization.

18790840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304 (or 300 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 18790840 is about 4334.8402508051. The cubic root of 18790840 is about 265.8573867599.

The spelling of 18790840 in words is "eighteen million, seven hundred ninety thousand, eight hundred forty".