18616871 has 12 divisors (see below), whose sum is σ = 23040432. Its totient is φ = 14728896.

The previous prime is 18616861. The next prime is 18616877. The reversal of 18616871 is 17861681.

It is not a de Polignac number, because 18616871 - 2¹⁸ = 18354727 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18616877) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6686 + ... + 9051.

It is an arithmetic number, because the mean of its divisors is an integer number (1920036).

Almost surely, 2^18616871 is an apocalyptic number.

18616871 is a deficient number, since it is larger than the sum of its proper divisors (4423561).

18616871 is a wasteful number, since it uses less digits than its factorization.

18616871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15770 (or 15757 counting only the distinct ones).

The product of its digits is 16128, while the sum is 38.

The square root of 18616871 is about 4314.7272219690. The cubic root of 18616871 is about 265.0343897460.

The spelling of 18616871 in words is "eighteen million, six hundred sixteen thousand, eight hundred seventy-one".