1399329369 has 6 divisors (see below), whose sum is σ = 2021253546. Its totient is φ = 932886240.

The previous prime is 1399329353. The next prime is 1399329391. The reversal of 1399329369 is 9639239931.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1397264400 + 2064969 = 37380^2 + 1437^2 .

It is not a de Polignac number, because 1399329369 - 2⁴ = 1399329353 is a prime.

It is a super-2 number, since 2×1399329369² = 3916245365891876322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1399329319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 77740512 + ... + 77740529.

It is an arithmetic number, because the mean of its divisors is an integer number (336875591).

Almost surely, 2^1399329369 is an apocalyptic number.

It is an amenable number.

1399329369 is a deficient number, since it is larger than the sum of its proper divisors (621924177).

1399329369 is a wasteful number, since it uses less digits than its factorization.

1399329369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155481047 (or 155481044 counting only the distinct ones).

The product of its digits is 2125764, while the sum is 54.

The square root of 1399329369 is about 37407.6111105748. The cubic root of 1399329369 is about 1118.5102879605.

The spelling of 1399329369 in words is "one billion, three hundred ninety-nine million, three hundred twenty-nine thousand, three hundred sixty-nine".