321340240 has 80 divisors (see below), whose sum is σ = 808448256. Its totient is φ = 118080000.

The previous prime is 321340223. The next prime is 321340259. The reversal of 321340240 is 42043123.

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

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, 260425 + ... + 261655.

Almost surely, 2^321340240 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 321340240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (404224128).

321340240 is an abundant number, since it is smaller than the sum of its proper divisors (487108016).

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

321340240 is a wasteful number, since it uses less digits than its factorization.

321340240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1508 (or 1502 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 321340240 is about 17925.9655249027. The cubic root of 321340240 is about 684.9439562013.

Adding to 321340240 its reverse (42043123), we get a palindrome (363383363).

The spelling of 321340240 in words is "three hundred twenty-one million, three hundred forty thousand, two hundred forty".