1320865919 has 6 divisors (see below), whose sum is σ = 1380792336. Its totient is φ = 1263436460.

The previous prime is 1320865877. The next prime is 1320865933. The reversal of 1320865919 is 9195680231.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1320865919 is a prime.

It is a super-2 number, since 2×1320865919² = 3489373551951429122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1320865919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320865969) 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 5 ways as a sum of consecutive naturals, for example, 1247927 + ... + 1248984.

It is an arithmetic number, because the mean of its divisors is an integer number (230132056).

Almost surely, 2^1320865919 is an apocalyptic number.

1320865919 is a deficient number, since it is larger than the sum of its proper divisors (59926417).

1320865919 is an equidigital number, since it uses as much as digits as its factorization.

1320865919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2496957 (or 2496934 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 1320865919 is about 36343.7191134864. The cubic root of 1320865919 is about 1097.2011266506.

The spelling of 1320865919 in words is "one billion, three hundred twenty million, eight hundred sixty-five thousand, nine hundred nineteen".