331140432 has 80 divisors (see below), whose sum is σ = 997654400. Its totient is φ = 94606848.

The previous prime is 331140421. The next prime is 331140437. The reversal of 331140432 is 234041133.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 331140399 and 331140408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331140437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6408 + ... + 26520.

It is an arithmetic number, because the mean of its divisors is an integer number (12470680).

Almost surely, 2^331140432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 331140432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (498827200).

331140432 is an abundant number, since it is smaller than the sum of its proper divisors (666513968).

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

331140432 is a wasteful number, since it uses less digits than its factorization.

331140432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20145 (or 20125 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 331140432 is about 18197.2644097952. The cubic root of 331140432 is about 691.8374550008.

Adding to 331140432 its reverse (234041133), we get a palindrome (565181565).

The spelling of 331140432 in words is "three hundred thirty-one million, one hundred forty thousand, four hundred thirty-two".