321543040 has 128 divisors (see below), whose sum is σ = 946249920. Its totient is φ = 101744640.

The previous prime is 321542989. The next prime is 321543041. The reversal of 321543040 is 40345123.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321543041) 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, 55480 + ... + 61000.

Almost surely, 2^321543040 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 321543040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (473124960).

321543040 is an abundant number, since it is smaller than the sum of its proper divisors (624706880).

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

321543040 is a wasteful number, since it uses less digits than its factorization.

321543040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5560 (or 5548 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 321543040 is about 17931.6212317794. The cubic root of 321543040 is about 685.0880168216.

Adding to 321543040 its reverse (40345123), we get a palindrome (361888163).

The spelling of 321543040 in words is "three hundred twenty-one million, five hundred forty-three thousand, forty".