231442440 has 32 divisors (see below), whose sum is σ = 694327680. Its totient is φ = 61717952.

The previous prime is 231442411. The next prime is 231442451. The reversal of 231442440 is 44244132.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 231442440.

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 7 ways as a sum of consecutive naturals, for example, 964224 + ... + 964463.

It is an arithmetic number, because the mean of its divisors is an integer number (21697740).

Almost surely, 2^231442440 is an apocalyptic number.

231442440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231442440 is an abundant number, since it is smaller than the sum of its proper divisors (462885240).

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

231442440 is a wasteful number, since it uses less digits than its factorization.

231442440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1928701 (or 1928697 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 231442440 is about 15213.2323981460. The cubic root of 231442440 is about 613.9707286211.

Adding to 231442440 its reverse (44244132), we get a palindrome (275686572).

The spelling of 231442440 in words is "two hundred thirty-one million, four hundred forty-two thousand, four hundred forty".