18879231 has 16 divisors (see below), whose sum is σ = 30461184. Its totient is φ = 10153344.

The previous prime is 18879209. The next prime is 18879239. The reversal of 18879231 is 13297881.

It is not a de Polignac number, because 18879231 - 2⁵ = 18879199 is a prime.

It is a super-2 number, since 2×18879231² = 712850726302722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18879231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18879239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26085 + ... + 26798.

It is an arithmetic number, because the mean of its divisors is an integer number (1903824).

Almost surely, 2^18879231 is an apocalyptic number.

18879231 is a deficient number, since it is larger than the sum of its proper divisors (11581953).

18879231 is a wasteful number, since it uses less digits than its factorization.

18879231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52910.

The product of its digits is 24192, while the sum is 39.

The square root of 18879231 is about 4345.0237053439. The cubic root of 18879231 is about 266.2735939769.

It can be divided in two parts, 18879 and 231, that added together give a triangular number (19110 = T₁₉₅).

The spelling of 18879231 in words is "eighteen million, eight hundred seventy-nine thousand, two hundred thirty-one".