321242440 has 64 divisors (see below), whose sum is σ = 736588800. Its totient is φ = 126067968.

The previous prime is 321242437. The next prime is 321242447. The reversal of 321242440 is 44242123.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (321242447) 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, 875137 + ... + 875503.

It is an arithmetic number, because the mean of its divisors is an integer number (11509200).

Almost surely, 2^321242440 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 321242440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (368294400).

321242440 is an abundant number, since it is smaller than the sum of its proper divisors (415346360).

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

321242440 is a wasteful number, since it uses less digits than its factorization.

321242440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734 (or 730 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 321242440 is about 17923.2374307768. The cubic root of 321242440 is about 684.8744615166.

Adding to 321242440 its reverse (44242123), we get a palindrome (365484563).

The spelling of 321242440 in words is "three hundred twenty-one million, two hundred forty-two thousand, four hundred forty".