231403204240 has 160 divisors (see below), whose sum is σ = 606853658880. Its totient is φ = 81420269568.

The previous prime is 231403204199. The next prime is 231403204243. The reversal of 231403204240 is 42402304132.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (231403204243) 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, 6416499 + ... + 6452461.

It is an arithmetic number, because the mean of its divisors is an integer number (3792835368).

Almost surely, 2^231403204240 is an apocalyptic number.

231403204240 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 231403204240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (303426829440).

231403204240 is an abundant number, since it is smaller than the sum of its proper divisors (375450454640).

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

231403204240 is a wasteful number, since it uses less digits than its factorization.

231403204240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36281 (or 36275 counting only the distinct ones).

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

Adding to 231403204240 its reverse (42402304132), we get a palindrome (273805508372).

The spelling of 231403204240 in words is "two hundred thirty-one billion, four hundred three million, two hundred four thousand, two hundred forty".