18986967 has 40 divisors (see below), whose sum is σ = 30056400. Its totient is φ = 11926656.

The previous prime is 18986963. The next prime is 18986969. The reversal of 18986967 is 76968981.

It is not a de Polignac number, because 18986967 - 2² = 18986963 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18986963) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 138523 + ... + 138659.

It is an arithmetic number, because the mean of its divisors is an integer number (751410).

Almost surely, 2^18986967 is an apocalyptic number.

18986967 is a deficient number, since it is larger than the sum of its proper divisors (11069433).

18986967 is a wasteful number, since it uses less digits than its factorization.

18986967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237 (or 228 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 18986967 is about 4357.4036994522. The cubic root of 18986967 is about 266.7791381467.

The spelling of 18986967 in words is "eighteen million, nine hundred eighty-six thousand, nine hundred sixty-seven".