331421440 has 144 divisors (see below), whose sum is σ = 927747072. Its totient is φ = 111071232.

The previous prime is 331421423. The next prime is 331421471. The reversal of 331421440 is 44124133.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 420727 + ... + 421513.

It is an arithmetic number, because the mean of its divisors is an integer number (6442688).

Almost surely, 2^331421440 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 331421440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (463873536).

331421440 is an abundant number, since it is smaller than the sum of its proper divisors (596325632).

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

331421440 is an equidigital number, since it uses as much as digits as its factorization.

331421440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862 (or 848 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 331421440 is about 18204.9839329784. The cubic root of 331421440 is about 692.0330989770.

Adding to 331421440 its reverse (44124133), we get a palindrome (375545573).

The spelling of 331421440 in words is "three hundred thirty-one million, four hundred twenty-one thousand, four hundred forty".