331023440 has 80 divisors (see below), whose sum is σ = 842624640. Its totient is φ = 119938560.

The previous prime is 331023421. The next prime is 331023449. The reversal of 331023440 is 44320133.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331023449) 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, 341837 + ... + 342803.

It is an arithmetic number, because the mean of its divisors is an integer number (10532808).

Almost surely, 2^331023440 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 331023440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (421312320).

331023440 is an abundant number, since it is smaller than the sum of its proper divisors (511601200).

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

331023440 is a wasteful number, since it uses less digits than its factorization.

331023440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380 (or 1374 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 331023440 is about 18194.0495767160. The cubic root of 331023440 is about 691.7559699534.

Adding to 331023440 its reverse (44320133), we get a palindrome (375343573).

The spelling of 331023440 in words is "three hundred thirty-one million, twenty-three thousand, four hundred forty".