18137668 has 6 divisors (see below), whose sum is σ = 31740926. Its totient is φ = 9068832.

The previous prime is 18137641. The next prime is 18137687. The reversal of 18137668 is 86673181.

It can be written as a sum of positive squares in only one way, i.e., 10252804 + 7884864 = 3202^2 + 2808^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18137668.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2267205 + ... + 2267212.

Almost surely, 2^18137668 is an apocalyptic number.

It is an amenable number.

18137668 is a deficient number, since it is larger than the sum of its proper divisors (13603258).

18137668 is a wasteful number, since it uses less digits than its factorization.

18137668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4534421 (or 4534419 counting only the distinct ones).

The product of its digits is 48384, while the sum is 40.

The square root of 18137668 is about 4258.8341127590. The cubic root of 18137668 is about 262.7405770289.

The spelling of 18137668 in words is "eighteen million, one hundred thirty-seven thousand, six hundred sixty-eight".