18986694 has 16 divisors (see below), whose sum is σ = 39198720. Its totient is φ = 6124680.

The previous prime is 18986689. The next prime is 18986699. The reversal of 18986694 is 49668981.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18986689) and next prime (18986699).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18986699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50854 + ... + 51225.

It is an arithmetic number, because the mean of its divisors is an integer number (2449920).

Almost surely, 2^18986694 is an apocalyptic number.

18986694 is an abundant number, since it is smaller than the sum of its proper divisors (20212026).

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

18986694 is a wasteful number, since it uses less digits than its factorization.

18986694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102115.

The product of its digits is 746496, while the sum is 51.

The square root of 18986694 is about 4357.3723733461. The cubic root of 18986694 is about 266.7778595319. Note that the first 3 decimals are identical.

The spelling of 18986694 in words is "eighteen million, nine hundred eighty-six thousand, six hundred ninety-four".