18089790 has 32 divisors (see below), whose sum is σ = 43756416. Its totient is φ = 4786080.

The previous prime is 18089789. The next prime is 18089791. The reversal of 18089790 is 9798081.

It is an interprime number because it is at equal distance from previous prime (18089789) and next prime (18089791).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18089791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1629 + ... + 6231.

It is an arithmetic number, because the mean of its divisors is an integer number (1367388).

Almost surely, 2^18089790 is an apocalyptic number.

18089790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18089790 is an abundant number, since it is smaller than the sum of its proper divisors (25666626).

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

18089790 is a wasteful number, since it uses less digits than its factorization.

18089790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4744.

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

The square root of 18089790 is about 4253.2093764591. The cubic root of 18089790 is about 262.5091878870.

The spelling of 18089790 in words is "eighteen million, eighty-nine thousand, seven hundred ninety".