1323645399 has 12 divisors (see below), whose sum is σ = 1920357816. Its totient is φ = 878541552.

The previous prime is 1323645371. The next prime is 1323645451. The reversal of 1323645399 is 9935463231.

It is not a de Polignac number, because 1323645399 - 2⁹ = 1323644887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1323645329) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 321904 + ... + 325989.

It is an arithmetic number, because the mean of its divisors is an integer number (160029818).

Almost surely, 2^1323645399 is an apocalyptic number.

1323645399 is a deficient number, since it is larger than the sum of its proper divisors (596712417).

1323645399 is a wasteful number, since it uses less digits than its factorization.

1323645399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648126 (or 648123 counting only the distinct ones).

The product of its digits is 524880, while the sum is 45.

The square root of 1323645399 is about 36381.9378126015. The cubic root of 1323645399 is about 1097.9701958725.

The spelling of 1323645399 in words is "one billion, three hundred twenty-three million, six hundred forty-five thousand, three hundred ninety-nine".