18089716 has 12 divisors (see below), whose sum is σ = 31781988. Its totient is φ = 9009152.

The previous prime is 18089693. The next prime is 18089723. The reversal of 18089716 is 61798081.

It can be written as a sum of positive squares in 2 ways, for example, as 9363600 + 8726116 = 3060^2 + 2954^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7771 + ... + 9826.

It is an arithmetic number, because the mean of its divisors is an integer number (2648499).

Almost surely, 2^18089716 is an apocalyptic number.

It is an amenable number.

18089716 is a deficient number, since it is larger than the sum of its proper divisors (13692272).

18089716 is a wasteful number, since it uses less digits than its factorization.

18089716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17858 (or 17856 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 18089716 is about 4253.2006771372. The cubic root of 18089716 is about 262.5088299373.

The spelling of 18089716 in words is "eighteen million, eighty-nine thousand, seven hundred sixteen".