1397864717 has 2 divisors, whose sum is σ = 1397864718. Its totient is φ = 1397864716.

The previous prime is 1397864681. The next prime is 1397864737. The reversal of 1397864717 is 7174687931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1350268516 + 47596201 = 36746^2 + 6899^2 .

It is a cyclic number.

It is not a de Polignac number, because 1397864717 - 2⁶ = 1397864653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1397864737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698932358 + 698932359.

It is an arithmetic number, because the mean of its divisors is an integer number (698932359).

Almost surely, 2^1397864717 is an apocalyptic number.

It is an amenable number.

1397864717 is a deficient number, since it is larger than the sum of its proper divisors (1).

1397864717 is an equidigital number, since it uses as much as digits as its factorization.

1397864717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1778112, while the sum is 53.

The square root of 1397864717 is about 37388.0290601150. The cubic root of 1397864717 is about 1118.1199104300.

The spelling of 1397864717 in words is "one billion, three hundred ninety-seven million, eight hundred sixty-four thousand, seven hundred seventeen".