1320323136 has 112 divisors (see below), whose sum is σ = 3942527040. Its totient is φ = 386283520.

The previous prime is 1320323023. The next prime is 1320323141. The reversal of 1320323136 is 6313230231.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50470 + ... + 72026.

Almost surely, 2^1320323136 is an apocalyptic number.

1320323136 is a gapful number since it is divisible by the number (16) 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 1320323136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1971263520).

1320323136 is an abundant number, since it is smaller than the sum of its proper divisors (2622203904).

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

1320323136 is a wasteful number, since it uses less digits than its factorization.

1320323136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21612 (or 21602 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 24.

The square root of 1320323136 is about 36336.2509898861. The cubic root of 1320323136 is about 1097.0508152263.

Adding to 1320323136 its reverse (6313230231), we get a palindrome (7633553367).

The spelling of 1320323136 in words is "one billion, three hundred twenty million, three hundred twenty-three thousand, one hundred thirty-six".