231800018 has 16 divisors (see below), whose sum is σ = 350874720. Its totient is φ = 114846336.

The previous prime is 231800011. The next prime is 231800021. The reversal of 231800018 is 810008132.

It is a junction number, because it is equal to n+sod(n) for n = 231799966 and 231800002.

It is not an unprimeable number, because it can be changed into a prime (231800011) 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, 135746 + ... + 137442.

It is an arithmetic number, because the mean of its divisors is an integer number (21929670).

Almost surely, 2^231800018 is an apocalyptic number.

231800018 is a deficient number, since it is larger than the sum of its proper divisors (119074702).

231800018 is a wasteful number, since it uses less digits than its factorization.

231800018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2281.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 231800018 is about 15224.9800656684. The cubic root of 231800018 is about 614.2867603423.

It can be divided in two parts, 23 and 1800018, that multiplied together give a palindrome (41400414).

The spelling of 231800018 in words is "two hundred thirty-one million, eight hundred thousand, eighteen".