231042140 has 24 divisors (see below), whose sum is σ = 554501472. Its totient is φ = 79214400.

The previous prime is 231042127. The next prime is 231042157. The reversal of 231042140 is 41240132.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 825011 + ... + 825290.

It is an arithmetic number, because the mean of its divisors is an integer number (23104228).

Almost surely, 2^231042140 is an apocalyptic number.

231042140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231042140 is an abundant number, since it is smaller than the sum of its proper divisors (323459332).

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

231042140 is a wasteful number, since it uses less digits than its factorization.

231042140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1650317 (or 1650315 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 231042140 is about 15200.0703945738. The cubic root of 231042140 is about 613.6165522739.

Adding to 231042140 its reverse (41240132), we get a palindrome (272282272).

The spelling of 231042140 in words is "two hundred thirty-one million, forty-two thousand, one hundred forty".