18493686 has 12 divisors (see below), whose sum is σ = 40069692. Its totient is φ = 6164556.

The previous prime is 18493649. The next prime is 18493687. The reversal of 18493686 is 68639481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18493687) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 513696 + ... + 513731.

It is an arithmetic number, because the mean of its divisors is an integer number (3339141).

Almost surely, 2^18493686 is an apocalyptic number.

18493686 is an abundant number, since it is smaller than the sum of its proper divisors (21576006).

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

18493686 is a wasteful number, since it uses less digits than its factorization.

18493686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027435 (or 1027432 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 18493686 is about 4300.4285832926. The cubic root of 18493686 is about 264.4485315979.

The spelling of 18493686 in words is "eighteen million, four hundred ninety-three thousand, six hundred eighty-six".