231340 has 24 divisors (see below), whose sum is σ = 498960. Its totient is φ = 90048.

The previous prime is 231331. The next prime is 231347. The reversal of 231340 is 43132.

It is a plaindrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 231340.

It is not an unprimeable number, because it can be changed into a prime (231347) by changing a digit.

231340 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 726 + ... + 994.

It is an arithmetic number, because the mean of its divisors is an integer number (20790).

2²³¹³⁴⁰ is an apocalyptic number.

231340 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 231340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (249480).

231340 is an abundant number, since it is smaller than the sum of its proper divisors (267620).

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

231340 is a wasteful number, since it uses less digits than its factorization.

231340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321 (or 319 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 231340 is about 480.9781699828. The cubic root of 231340 is about 61.3880130943.

Adding to 231340 its reverse (43132), we get a palindrome (274472).

The spelling of 231340 in words is "two hundred thirty-one thousand, three hundred forty".