321004240 has 40 divisors (see below), whose sum is σ = 785619360. Its totient is φ = 121643136.

The previous prime is 321004223. The next prime is 321004249. The reversal of 321004240 is 42400123.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321004249) 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, 104074 + ... + 107113.

It is an arithmetic number, because the mean of its divisors is an integer number (19640484).

Almost surely, 2^321004240 is an apocalyptic number.

It is an amenable number.

321004240 is an abundant number, since it is smaller than the sum of its proper divisors (464615120).

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

321004240 is a wasteful number, since it uses less digits than its factorization.

321004240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211219 (or 211213 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 321004240 is about 17916.5911936395. The cubic root of 321004240 is about 684.7051424241.

Adding to 321004240 its reverse (42400123), we get a palindrome (363404363).

The spelling of 321004240 in words is "three hundred twenty-one million, four thousand, two hundred forty".