18089812 has 24 divisors (see below), whose sum is σ = 34227872. Its totient is φ = 8316000.

The previous prime is 18089809. The next prime is 18089839. The reversal of 18089812 is 21898081.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16687 + ... + 17737.

Almost surely, 2^18089812 is an apocalyptic number.

It is an amenable number.

18089812 is a deficient number, since it is larger than the sum of its proper divisors (16138060).

18089812 is a wasteful number, since it uses less digits than its factorization.

18089812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1399 (or 1397 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 37.

The square root of 18089812 is about 4253.2119627406. The cubic root of 18089812 is about 262.5092943043.

The spelling of 18089812 in words is "eighteen million, eighty-nine thousand, eight hundred twelve".