18389790 has 24 divisors (see below), whose sum is σ = 47813688. Its totient is φ = 4903920.

The previous prime is 18389783. The next prime is 18389807. The reversal of 18389790 is 9798381.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102076 + ... + 102255.

It is an arithmetic number, because the mean of its divisors is an integer number (1992237).

Almost surely, 2^18389790 is an apocalyptic number.

18389790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18389790 is an abundant number, since it is smaller than the sum of its proper divisors (29423898).

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

18389790 is a wasteful number, since it uses less digits than its factorization.

18389790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204344 (or 204341 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 18389790 is about 4288.3318435028. The cubic root of 18389790 is about 263.9523846632.

It can be divided in two parts, 1838 and 9790, that added together give a triangular number (11628 = T₁₅₂).

The spelling of 18389790 in words is "eighteen million, three hundred eighty-nine thousand, seven hundred ninety".