231342140 has 24 divisors (see below), whose sum is σ = 492664032. Its totient is φ = 91232960.

The previous prime is 231342109. The next prime is 231342143. The reversal of 231342140 is 41243132.

231342140 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 (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231342143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80039 + ... + 82878.

It is an arithmetic number, because the mean of its divisors is an integer number (20527668).

Almost surely, 2^231342140 is an apocalyptic number.

231342140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231342140 is an abundant number, since it is smaller than the sum of its proper divisors (261321892).

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

231342140 is a wasteful number, since it uses less digits than its factorization.

231342140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162997 (or 162995 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 231342140 is about 15209.9355685683. The cubic root of 231342140 is about 613.8820238269.

Adding to 231342140 its reverse (41243132), we get a palindrome (272585272).

The spelling of 231342140 in words is "two hundred thirty-one million, three hundred forty-two thousand, one hundred forty".