1321305400 has 24 divisors (see below), whose sum is σ = 3072035520. Its totient is φ = 528522080.

The previous prime is 1321305397. The next prime is 1321305439. The reversal of 1321305400 is 45031231.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3303064 + ... + 3303463.

It is an arithmetic number, because the mean of its divisors is an integer number (128001480).

Almost surely, 2^1321305400 is an apocalyptic number.

1321305400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321305400 is an abundant number, since it is smaller than the sum of its proper divisors (1750730120).

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

1321305400 is a wasteful number, since it uses less digits than its factorization.

1321305400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6606543 (or 6606534 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 1321305400 is about 36349.7647860340. The cubic root of 1321305400 is about 1097.3228007666.

Adding to 1321305400 its reverse (45031231), we get a palindrome (1366336631).

The spelling of 1321305400 in words is "one billion, three hundred twenty-one million, three hundred five thousand, four hundred".