321305240 has 32 divisors (see below), whose sum is σ = 730103760. Its totient is φ = 127248000.

The previous prime is 321305203. The next prime is 321305249. The reversal of 321305240 is 42503123.

It is a happy number.

It is a super-6 number, since 6×321305240⁶ (a number of 52 digits) contains 666666 as substring.

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 (321305249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35726 + ... + 43805.

Almost surely, 2^321305240 is an apocalyptic number.

It is an amenable number.

321305240 is an abundant number, since it is smaller than the sum of its proper divisors (408798520).

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

321305240 is a wasteful number, since it uses less digits than its factorization.

321305240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79643 (or 79639 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 321305240 is about 17924.9892608057. The cubic root of 321305240 is about 684.9190875357.

Adding to 321305240 its reverse (42503123), we get a palindrome (363808363).

The spelling of 321305240 in words is "three hundred twenty-one million, three hundred five thousand, two hundred forty".