231440320240 has 20 divisors (see below), whose sum is σ = 538098744744. Its totient is φ = 92576128064.

The previous prime is 231440320231. The next prime is 231440320249. The reversal of 231440320240 is 42023044132.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (231440320231) and next prime (231440320249).

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231440320249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1446501922 + ... + 1446502081.

Almost surely, 2^231440320240 is an apocalyptic number.

231440320240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231440320240 is an abundant number, since it is smaller than the sum of its proper divisors (306658424504).

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

231440320240 is a wasteful number, since it uses less digits than its factorization.

231440320240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2893004016 (or 2893004010 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 231440320240 its reverse (42023044132), we get a palindrome (273463364372).

The spelling of 231440320240 in words is "two hundred thirty-one billion, four hundred forty million, three hundred twenty thousand, two hundred forty".