18007686 has 12 divisors (see below), whose sum is σ = 39016692. Its totient is φ = 6002556.

The previous prime is 18007663. The next prime is 18007697. The reversal of 18007686 is 68670081.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18007686.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 500196 + ... + 500231.

It is an arithmetic number, because the mean of its divisors is an integer number (3251391).

Almost surely, 2^18007686 is an apocalyptic number.

18007686 is an abundant number, since it is smaller than the sum of its proper divisors (21009006).

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

18007686 is a wasteful number, since it uses less digits than its factorization.

18007686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000435 (or 1000432 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 18007686 is about 4243.5463942321. The cubic root of 18007686 is about 262.1114359987. Note that the first 3 decimals are identical.

The spelling of 18007686 in words is "eighteen million, seven thousand, six hundred eighty-six".