1321500540 has 96 divisors (see below), whose sum is σ = 3907008000. Its totient is φ = 332819712.

The previous prime is 1321500539. The next prime is 1321500577. The reversal of 1321500540 is 450051231.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 407646 + ... + 410874.

It is an arithmetic number, because the mean of its divisors is an integer number (40698000).

Almost surely, 2^1321500540 is an apocalyptic number.

1321500540 is a gapful number since it is divisible by the number (10) 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 1321500540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1953504000).

1321500540 is an abundant number, since it is smaller than the sum of its proper divisors (2585507460).

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

1321500540 is a wasteful number, since it uses less digits than its factorization.

1321500540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3619 (or 3617 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 1321500540 is about 36352.4488858729. The cubic root of 1321500540 is about 1097.3768183138.

Adding to 1321500540 its reverse (450051231), we get a palindrome (1771551771).

The spelling of 1321500540 in words is "one billion, three hundred twenty-one million, five hundred thousand, five hundred forty".