231040 has 48 divisors (see below), whose sum is σ = 582930. Its totient is φ = 87552.

The previous prime is 231031. The next prime is 231041. The reversal of 231040 is 40132.

231040 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 207936 + 23104 = 456^2 + 152^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (231041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12151 + ... + 12169.

2²³¹⁰⁴⁰ is an apocalyptic number.

231040 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 231040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (291465).

231040 is an abundant number, since it is smaller than the sum of its proper divisors (351890).

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

231040 is an equidigital number, since it uses as much as digits as its factorization.

231040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57 (or 26 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 231040 is about 480.6662043456. Note that the first 3 decimals coincide. The cubic root of 231040 is about 61.3614657752.

Multiplying 231040 by its sum of digits (10), we get a square (2310400 = 1520²).

231040 divided by its sum of digits (10) gives a square (23104 = 152²).

Adding to 231040 its reverse (40132), we get a palindrome (271172).

The spelling of 231040 in words is "two hundred thirty-one thousand, forty".