231004240 has 40 divisors (see below), whose sum is σ = 538838280. Its totient is φ = 92100096.

The previous prime is 231004231. The next prime is 231004247. The reversal of 231004240 is 42400132.

It can be written as a sum of positive squares in 4 ways, for example, as 6843456 + 224160784 = 2616^2 + 14972^2 .

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 (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231004247) 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, 20806 + ... + 29914.

It is an arithmetic number, because the mean of its divisors is an integer number (13470957).

Almost surely, 2^231004240 is an apocalyptic number.

231004240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231004240 is an abundant number, since it is smaller than the sum of its proper divisors (307834040).

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

231004240 is a wasteful number, since it uses less digits than its factorization.

231004240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9439 (or 9433 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 231004240 is about 15198.8236386899. The cubic root of 231004240 is about 613.5829980211.

Adding to 231004240 its reverse (42400132), we get a palindrome (273404372).

The spelling of 231004240 in words is "two hundred thirty-one million, four thousand, two hundred forty".