1320399232 has 64 divisors (see below), whose sum is σ = 2767770000. Its totient is φ = 626526208.

The previous prime is 1320399221. The next prime is 1320399233. The reversal of 1320399232 is 2329930231.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320399233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215994 + ... + 222022.

Almost surely, 2^1320399232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1320399232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1383885000).

1320399232 is an abundant number, since it is smaller than the sum of its proper divisors (1447370768).

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

1320399232 is an equidigital number, since it uses as much as digits as its factorization.

1320399232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6131 (or 6119 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 34.

The square root of 1320399232 is about 36337.2980833743. The cubic root of 1320399232 is about 1097.0718907678.

The spelling of 1320399232 in words is "one billion, three hundred twenty million, three hundred ninety-nine thousand, two hundred thirty-two".