18090936 has 24 divisors (see below), whose sum is σ = 48996480. Its totient is φ = 6030288.

The previous prime is 18090923. The next prime is 18090937. The reversal of 18090936 is 63909081.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 18090936.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18090937) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 125560 + ... + 125703.

It is an arithmetic number, because the mean of its divisors is an integer number (2041520).

Almost surely, 2^18090936 is an apocalyptic number.

It is an amenable number.

18090936 is an abundant number, since it is smaller than the sum of its proper divisors (30905544).

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

18090936 is a wasteful number, since it uses less digits than its factorization.

18090936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251275 (or 251268 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 18090936 is about 4253.3440961201. The cubic root of 18090936 is about 262.5147311461.

The spelling of 18090936 in words is "eighteen million, ninety thousand, nine hundred thirty-six".