402440232320 has 64 divisors (see below), whose sum is σ = 1099524218400. Its totient is φ = 137979506688.

The previous prime is 402440232319. The next prime is 402440232323. The reversal of 402440232320 is 23232044204.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 402440232320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402440232323) 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, 44910725 + ... + 44919684.

Almost surely, 2^402440232320 is an apocalyptic number.

402440232320 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

402440232320 is an abundant number, since it is smaller than the sum of its proper divisors (697083986080).

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

402440232320 is an equidigital number, since it uses as much as digits as its factorization.

402440232320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89830435 (or 89830423 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 26.

Adding to 402440232320 its reverse (23232044204), we get a palindrome (425672276524).

The spelling of 402440232320 in words is "four hundred two billion, four hundred forty million, two hundred thirty-two thousand, three hundred twenty".