231423240 has 128 divisors (see below), whose sum is σ = 729907200. Its totient is φ = 58586880.

The previous prime is 231423239. The next prime is 231423259. The reversal of 231423240 is 42324132.

231423240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 526941 + ... + 527379.

It is an arithmetic number, because the mean of its divisors is an integer number (5702400).

Almost surely, 2^231423240 is an apocalyptic number.

231423240 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 231423240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (364953600).

231423240 is an abundant number, since it is smaller than the sum of its proper divisors (498483960).

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

231423240 is a wasteful number, since it uses less digits than its factorization.

231423240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667 (or 663 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 231423240 is about 15212.6013554553. The cubic root of 231423240 is about 613.9537502255.

Adding to 231423240 its reverse (42324132), we get a palindrome (273747372).

The spelling of 231423240 in words is "two hundred thirty-one million, four hundred twenty-three thousand, two hundred forty".