18886986 has 16 divisors (see below), whose sum is σ = 41971200. Its totient is φ = 6295644.

The previous prime is 18886963. The next prime is 18887009. The reversal of 18886986 is 68968881.

It is an interprime number because it is at equal distance from previous prime (18886963) and next prime (18887009).

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 349759 = 18886986 / (1 + 8 + 8 + 8 + 6 + 9 + 8 + 6).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174826 + ... + 174933.

It is an arithmetic number, because the mean of its divisors is an integer number (2623200).

Almost surely, 2^18886986 is an apocalyptic number.

18886986 is an abundant number, since it is smaller than the sum of its proper divisors (23084214).

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

18886986 is a wasteful number, since it uses less digits than its factorization.

18886986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349770 (or 349764 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 54.

The square root of 18886986 is about 4345.9160139147. The cubic root of 18886986 is about 266.3100479520.

The spelling of 18886986 in words is "eighteen million, eight hundred eighty-six thousand, nine hundred eighty-six".