18089436 has 12 divisors (see below), whose sum is σ = 42208712. Its totient is φ = 6029808.

The previous prime is 18089429. The next prime is 18089437. The reversal of 18089436 is 63498081.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 18089394 and 18089403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18089437) 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, 753715 + ... + 753738.

Almost surely, 2^18089436 is an apocalyptic number.

It is an amenable number.

18089436 is an abundant number, since it is smaller than the sum of its proper divisors (24119276).

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

18089436 is a wasteful number, since it uses less digits than its factorization.

18089436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1507460 (or 1507458 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 18089436 is about 4253.1677606227. The cubic root of 18089436 is about 262.5074755241.

The spelling of 18089436 in words is "eighteen million, eighty-nine thousand, four hundred thirty-six".