321040840 has 32 divisors (see below), whose sum is σ = 722882880. Its totient is φ = 128320192.

The previous prime is 321040807. The next prime is 321040849. The reversal of 321040840 is 48040123.

It is not an unprimeable number, because it can be changed into a prime (321040849) 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, 78117 + ... + 82123.

It is an arithmetic number, because the mean of its divisors is an integer number (22590090).

Almost surely, 2^321040840 is an apocalyptic number.

It is an amenable number.

321040840 is an abundant number, since it is smaller than the sum of its proper divisors (401842040).

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

321040840 is a wasteful number, since it uses less digits than its factorization.

321040840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6021 (or 6017 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 321040840 is about 17917.6125641783. The cubic root of 321040840 is about 684.7311641530.

Adding to 321040840 its reverse (48040123), we get a palindrome (369080963).

The spelling of 321040840 in words is "three hundred twenty-one million, forty thousand, eight hundred forty".