1320399869 has 2 divisors, whose sum is σ = 1320399870. Its totient is φ = 1320399868.

The previous prime is 1320399863. The next prime is 1320399923. The reversal of 1320399869 is 9689930231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 985143769 + 335256100 = 31387^2 + 18310^2 .

It is an emirp because it is prime and its reverse (9689930231) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1320399869 is a prime.

It is a super-2 number, since 2×1320399869² = 3486911628110434322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320399863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660199934 + 660199935.

It is an arithmetic number, because the mean of its divisors is an integer number (660199935).

Almost surely, 2^1320399869 is an apocalyptic number.

It is an amenable number.

1320399869 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320399869 is an equidigital number, since it uses as much as digits as its factorization.

1320399869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 629856, while the sum is 50.

The square root of 1320399869 is about 36337.3068484719. The cubic root of 1320399869 is about 1097.0720671878.

The spelling of 1320399869 in words is "one billion, three hundred twenty million, three hundred ninety-nine thousand, eight hundred sixty-nine".