231812 has 24 divisors (see below), whose sum is σ = 491904. Its totient is φ = 93312.

The previous prime is 231809. The next prime is 231821. The reversal of 231812 is 218132.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 231812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233 + ... + 719.

It is an arithmetic number, because the mean of its divisors is an integer number (20496).

2²³¹⁸¹² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (245952).

231812 is an abundant number, since it is smaller than the sum of its proper divisors (260092).

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

231812 is a wasteful number, since it uses less digits than its factorization.

231812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515 (or 513 counting only the distinct ones).

The product of its digits is 96, while the sum is 17.

The square root of 231812 is about 481.4685867219. The cubic root of 231812 is about 61.4297344548.

Adding to 231812 its reverse (218132), we get a palindrome (449944).

The spelling of 231812 in words is "two hundred thirty-one thousand, eight hundred twelve".