1398699697 has 2 divisors, whose sum is σ = 1398699698. Its totient is φ = 1398699696.

The previous prime is 1398699691. The next prime is 1398699721. The reversal of 1398699697 is 7969968931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1345715856 + 52983841 = 36684^2 + 7279^2 .

It is a cyclic number.

It is not a de Polignac number, because 1398699697 - 2³ = 1398699689 is a prime.

It is not a weakly prime, because it can be changed into another prime (1398699691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699349848 + 699349849.

It is an arithmetic number, because the mean of its divisors is an integer number (699349849).

Almost surely, 2^1398699697 is an apocalyptic number.

It is an amenable number.

1398699697 is a deficient number, since it is larger than the sum of its proper divisors (1).

1398699697 is an equidigital number, since it uses as much as digits as its factorization.

1398699697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39680928, while the sum is 67.

The square root of 1398699697 is about 37399.1938014712. The cubic root of 1398699697 is about 1118.3424932316.

The spelling of 1398699697 in words is "one billion, three hundred ninety-eight million, six hundred ninety-nine thousand, six hundred ninety-seven".