231444240 has 40 divisors (see below), whose sum is σ = 717477888. Its totient is φ = 61718400.

The previous prime is 231444229. The next prime is 231444247. The reversal of 231444240 is 42444132.

It is a happy number.

231444240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

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 231444240.

It is not an unprimeable number, because it can be changed into a prime (231444247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 481936 + ... + 482415.

Almost surely, 2^231444240 is an apocalyptic number.

231444240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231444240 is an abundant number, since it is smaller than the sum of its proper divisors (486033648).

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

231444240 is a wasteful number, since it uses less digits than its factorization.

231444240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964367 (or 964361 counting only the distinct ones).

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

The square root of 231444240 is about 15213.2915570563. The cubic root of 231444240 is about 613.9723202976.

Adding to 231444240 its reverse (42444132), we get a palindrome (273888372).

The spelling of 231444240 in words is "two hundred thirty-one million, four hundred forty-four thousand, two hundred forty".