1398376817 has 2 divisors, whose sum is σ = 1398376818. Its totient is φ = 1398376816.

The previous prime is 1398376787. The next prime is 1398376829. The reversal of 1398376817 is 7186738931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 936298801 + 462078016 = 30599^2 + 21496^2 .

It is a cyclic number.

It is not a de Polignac number, because 1398376817 - 2⁶ = 1398376753 is a prime.

It is not a weakly prime, because it can be changed into another prime (1398376417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699188408 + 699188409.

It is an arithmetic number, because the mean of its divisors is an integer number (699188409).

Almost surely, 2^1398376817 is an apocalyptic number.

It is an amenable number.

1398376817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1398376817 is an equidigital number, since it uses as much as digits as its factorization.

1398376817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1524096, while the sum is 53.

The square root of 1398376817 is about 37394.8768817334. The cubic root of 1398376817 is about 1118.2564327729.

The spelling of 1398376817 in words is "one billion, three hundred ninety-eight million, three hundred seventy-six thousand, eight hundred seventeen".