231140 has 48 divisors (see below), whose sum is σ = 602112. Its totient is φ = 72576.

The previous prime is 231131. The next prime is 231169. The reversal of 231140 is 41132.

231140 = T₁₆₈ + T₁₆₉ + ... + T₁₈₂.

It is a happy number.

231140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1757 + ... + 1883.

It is an arithmetic number, because the mean of its divisors is an integer number (12544).

2²³¹¹⁴⁰ is an apocalyptic number.

231140 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 231140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (301056).

231140 is an abundant number, since it is smaller than the sum of its proper divisors (370972).

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

231140 is a wasteful number, since it uses less digits than its factorization.

231140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156 (or 154 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 231140 is about 480.7702153836. The cubic root of 231140 is about 61.3703174336.

Adding to 231140 its reverse (41132), we get a palindrome (272272).

The spelling of 231140 in words is "two hundred thirty-one thousand, one hundred forty".