323121540 has 96 divisors (see below), whose sum is σ = 1037352960. Its totient is φ = 73616256.

The previous prime is 323121529. The next prime is 323121541. The reversal of 323121540 is 45121323.

It is a super-2 number, since 2×323121540² = 208815059223943200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (323121541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 149709 + ... + 151851.

It is an arithmetic number, because the mean of its divisors is an integer number (10805760).

Almost surely, 2^323121540 is an apocalyptic number.

323121540 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 323121540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (518676480).

323121540 is an abundant number, since it is smaller than the sum of its proper divisors (714231420).

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

323121540 is a wasteful number, since it uses less digits than its factorization.

323121540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2521 (or 2519 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 323121540 is about 17975.5817708357. The cubic root of 323121540 is about 686.2072517922.

Adding to 323121540 its reverse (45121323), we get a palindrome (368242863).

The spelling of 323121540 in words is "three hundred twenty-three million, one hundred twenty-one thousand, five hundred forty".