18679871 has 4 divisors (see below), whose sum is σ = 21348432. Its totient is φ = 16011312.

The previous prime is 18679861. The next prime is 18679873. The reversal of 18679871 is 17897681.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18679871 - 2²² = 14485567 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18679873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1334270 + ... + 1334283.

It is an arithmetic number, because the mean of its divisors is an integer number (5337108).

Almost surely, 2^18679871 is an apocalyptic number.

18679871 is a deficient number, since it is larger than the sum of its proper divisors (2668561).

18679871 is an equidigital number, since it uses as much as digits as its factorization.

18679871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2668560.

The product of its digits is 169344, while the sum is 47.

The square root of 18679871 is about 4322.0216334489. The cubic root of 18679871 is about 265.3330143525. Note that the first 3 decimals are identical.

The spelling of 18679871 in words is "eighteen million, six hundred seventy-nine thousand, eight hundred seventy-one".