231342440 has 64 divisors (see below), whose sum is σ = 597542400. Its totient is φ = 78962688.

The previous prime is 231342437. The next prime is 231342457. The reversal of 231342440 is 44243132.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 65192 + ... + 68648.

It is an arithmetic number, because the mean of its divisors is an integer number (9336600).

Almost surely, 2^231342440 is an apocalyptic number.

231342440 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 231342440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (298771200).

231342440 is an abundant number, since it is smaller than the sum of its proper divisors (366199960).

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

231342440 is a wasteful number, since it uses less digits than its factorization.

231342440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3714 (or 3710 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 231342440 is about 15209.9454305398. The cubic root of 231342440 is about 613.8822891836.

Adding to 231342440 its reverse (44243132), we get a palindrome (275585572).

The spelling of 231342440 in words is "two hundred thirty-one million, three hundred forty-two thousand, four hundred forty".