18670986 has 40 divisors (see below), whose sum is σ = 43664544. Its totient is φ = 5951880.

The previous prime is 18670979. The next prime is 18671011. The reversal of 18670986 is 68907681.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1221 + ... + 6231.

Almost surely, 2^18670986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18670986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21832272).

18670986 is an abundant number, since it is smaller than the sum of its proper divisors (24993558).

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

18670986 is a wasteful number, since it uses less digits than its factorization.

18670986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5048 (or 5039 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 18670986 is about 4320.9936357278. The cubic root of 18670986 is about 265.2909395133.

The spelling of 18670986 in words is "eighteen million, six hundred seventy thousand, nine hundred eighty-six".