231140320 has 96 divisors (see below), whose sum is σ = 580003200. Its totient is φ = 86800896.

The previous prime is 231140311. The next prime is 231140321. The reversal of 231140320 is 23041132.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 231140294 and 231140303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231140321) 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, 422287 + ... + 422833.

It is an arithmetic number, because the mean of its divisors is an integer number (6041700).

Almost surely, 2^231140320 is an apocalyptic number.

231140320 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 231140320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290001600).

231140320 is an abundant number, since it is smaller than the sum of its proper divisors (348862880).

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

231140320 is a wasteful number, since it uses less digits than its factorization.

231140320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720 (or 712 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 231140320 is about 15203.2996418541. The cubic root of 231140320 is about 613.7034575480.

Adding to 231140320 its reverse (23041132), we get a palindrome (254181452).

The spelling of 231140320 in words is "two hundred thirty-one million, one hundred forty thousand, three hundred twenty".