1399571717 has 2 divisors, whose sum is σ = 1399571718. Its totient is φ = 1399571716.

The previous prime is 1399571683. The next prime is 1399571729. The reversal of 1399571717 is 7171759931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 716847076 + 682724641 = 26774^2 + 26129^2 .

It is a cyclic number.

It is not a de Polignac number, because 1399571717 - 2¹⁰ = 1399570693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1399571917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699785858 + 699785859.

It is an arithmetic number, because the mean of its divisors is an integer number (699785859).

Almost surely, 2^1399571717 is an apocalyptic number.

It is an amenable number.

1399571717 is a deficient number, since it is larger than the sum of its proper divisors (1).

1399571717 is an equidigital number, since it uses as much as digits as its factorization.

1399571717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 416745, while the sum is 50.

The square root of 1399571717 is about 37410.8502576458. The cubic root of 1399571717 is about 1118.5748553383.

The spelling of 1399571717 in words is "one billion, three hundred ninety-nine million, five hundred seventy-one thousand, seven hundred seventeen".