231204240 has 160 divisors (see below), whose sum is σ = 824054400. Its totient is φ = 59512320.

The previous prime is 231204229. The next prime is 231204241. The reversal of 231204240 is 42402132.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (231204241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60795 + ... + 64485.

It is an arithmetic number, because the mean of its divisors is an integer number (5150340).

Almost surely, 2^231204240 is an apocalyptic number.

231204240 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 231204240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (412027200).

231204240 is an abundant number, since it is smaller than the sum of its proper divisors (592850160).

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

231204240 is a wasteful number, since it uses less digits than its factorization.

231204240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3742 (or 3730 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 231204240 is about 15205.4016717744. The cubic root of 231204240 is about 613.7600239222.

Adding to 231204240 its reverse (42402132), we get a palindrome (273606372).

The spelling of 231204240 in words is "two hundred thirty-one million, two hundred four thousand, two hundred forty".