1323643944 has 64 divisors (see below), whose sum is σ = 3784573440. Its totient is φ = 377910720.

The previous prime is 1323643903. The next prime is 1323643963. The reversal of 1323643944 is 4493463231.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 396667 + ... + 399989.

It is an arithmetic number, because the mean of its divisors is an integer number (59133960).

Almost surely, 2^1323643944 is an apocalyptic number.

1323643944 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1323643944 is an abundant number, since it is smaller than the sum of its proper divisors (2460929496).

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

1323643944 is a wasteful number, since it uses less digits than its factorization.

1323643944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5710 (or 5706 counting only the distinct ones).

The product of its digits is 186624, while the sum is 39.

The square root of 1323643944 is about 36381.9178164098. The cubic root of 1323643944 is about 1097.9697935625.

The spelling of 1323643944 in words is "one billion, three hundred twenty-three million, six hundred forty-three thousand, nine hundred forty-four".