1399770785 has 16 divisors (see below), whose sum is σ = 1933704576. Its totient is φ = 952833408.

The previous prime is 1399770773. The next prime is 1399770829. The reversal of 1399770785 is 5870779931.

It is a cyclic number.

It is not a de Polignac number, because 1399770785 - 2¹⁸ = 1399508641 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1399770785.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141167 + ... + 150756.

It is an arithmetic number, because the mean of its divisors is an integer number (120856536).

Almost surely, 2^1399770785 is an apocalyptic number.

It is an amenable number.

1399770785 is a deficient number, since it is larger than the sum of its proper divisors (533933791).

1399770785 is a wasteful number, since it uses less digits than its factorization.

1399770785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292072.

The product of its (nonzero) digits is 3333960, while the sum is 56.

The square root of 1399770785 is about 37413.5107280779. The cubic root of 1399770785 is about 1118.6278863001.

The spelling of 1399770785 in words is "one billion, three hundred ninety-nine million, seven hundred seventy thousand, seven hundred eighty-five".