1320409792 has 56 divisors (see below), whose sum is σ = 2857601600. Its totient is φ = 601675776.

The previous prime is 1320409781. The next prime is 1320409799. The reversal of 1320409792 is 2979040231.

It is not an unprimeable number, because it can be changed into a prime (1320409799) 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, 55684 + ... + 75772.

It is an arithmetic number, because the mean of its divisors is an integer number (51028600).

Almost surely, 2^1320409792 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 1320409792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1428800800).

1320409792 is an abundant number, since it is smaller than the sum of its proper divisors (1537191808).

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

1320409792 is a wasteful number, since it uses less digits than its factorization.

1320409792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20193 (or 20183 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 1320409792 is about 36337.4433883288. The cubic root of 1320409792 is about 1097.0748154005.

The spelling of 1320409792 in words is "one billion, three hundred twenty million, four hundred nine thousand, seven hundred ninety-two".