18090772 has 12 divisors (see below), whose sum is σ = 36181600. Its totient is φ = 7753176.

The previous prime is 18090749. The next prime is 18090773. The reversal of 18090772 is 27709081.

18090772 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18090773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 323022 + ... + 323077.

Almost surely, 2^18090772 is an apocalyptic number.

It is an amenable number.

18090772 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18090772 is a wasteful number, since it uses less digits than its factorization.

18090772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646110 (or 646108 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 18090772 is about 4253.3248171284. The cubic root of 18090772 is about 262.5139378843.

The spelling of 18090772 in words is "eighteen million, ninety thousand, seven hundred seventy-two".