1398695999 has 2 divisors, whose sum is σ = 1398696000. Its totient is φ = 1398695998.

The previous prime is 1398695989. The next prime is 1398696007. The reversal of 1398695999 is 9995968931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1398695999 - 2²⁰ = 1397647423 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1398695939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699347999 + 699348000.

It is an arithmetic number, because the mean of its divisors is an integer number (699348000).

Almost surely, 2^1398695999 is an apocalyptic number.

1398695999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1398695999 is an equidigital number, since it uses as much as digits as its factorization.

1398695999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42515280, while the sum is 68.

The square root of 1398695999 is about 37399.1443618701. The cubic root of 1398695999 is about 1118.3415076414.

The spelling of 1398695999 in words is "one billion, three hundred ninety-eight million, six hundred ninety-five thousand, nine hundred ninety-nine".