1321802399 has 4 divisors (see below), whose sum is σ = 1334635536. Its totient is φ = 1308969264.

The previous prime is 1321802359. The next prime is 1321802401. The reversal of 1321802399 is 9932081231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321802399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321802359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6416414 + ... + 6416619.

It is an arithmetic number, because the mean of its divisors is an integer number (333658884).

Almost surely, 2^1321802399 is an apocalyptic number.

1321802399 is a deficient number, since it is larger than the sum of its proper divisors (12833137).

1321802399 is a wasteful number, since it uses less digits than its factorization.

1321802399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12833136.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 1321802399 is about 36356.6004873943. The cubic root of 1321802399 is about 1097.4603667348.

The spelling of 1321802399 in words is "one billion, three hundred twenty-one million, eight hundred two thousand, three hundred ninety-nine".