231240 has 64 divisors (see below), whose sum is σ = 725760. Its totient is φ = 58880.

The previous prime is 231223. The next prime is 231241. The reversal of 231240 is 42132.

231240 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (231241) 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, 4897 + ... + 4943.

It is an arithmetic number, because the mean of its divisors is an integer number (11340).

2²³¹²⁴⁰ is an apocalyptic number.

231240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (362880).

231240 is an abundant number, since it is smaller than the sum of its proper divisors (494520).

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

231240 is a wasteful number, since it uses less digits than its factorization.

231240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102 (or 98 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 231240 is about 480.8742039245. The cubic root of 231240 is about 61.3791665394.

Adding to 231240 its reverse (42132), we get a palindrome (273372).

The spelling of 231240 in words is "two hundred thirty-one thousand, two hundred forty".