18809790 has 32 divisors (see below), whose sum is σ = 45912960. Its totient is φ = 4930464.

The previous prime is 18809789. The next prime is 18809797. The reversal of 18809790 is 9790881.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18809797) 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, 3544 + ... + 7083.

It is an arithmetic number, because the mean of its divisors is an integer number (1434780).

Almost surely, 2^18809790 is an apocalyptic number.

18809790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18809790 is an abundant number, since it is smaller than the sum of its proper divisors (27103170).

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

18809790 is a wasteful number, since it uses less digits than its factorization.

18809790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10696.

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

The square root of 18809790 is about 4337.0254783665. The cubic root of 18809790 is about 265.9467264749.

The spelling of 18809790 in words is "eighteen million, eight hundred nine thousand, seven hundred ninety".