1396671917 has 2 divisors, whose sum is σ = 1396671918. Its totient is φ = 1396671916.

The previous prime is 1396671911. The next prime is 1396671919. The reversal of 1396671917 is 7191766931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1328675401 + 67996516 = 36451^2 + 8246^2 .

It is a cyclic number.

It is not a de Polignac number, because 1396671917 - 2⁶ = 1396671853 is a prime.

Together with 1396671919, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1396671911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698335958 + 698335959.

It is an arithmetic number, because the mean of its divisors is an integer number (698335959).

Almost surely, 2^1396671917 is an apocalyptic number.

It is an amenable number.

1396671917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1396671917 is an equidigital number, since it uses as much as digits as its factorization.

1396671917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 428652, while the sum is 50.

The square root of 1396671917 is about 37372.0740259355. The cubic root of 1396671917 is about 1117.8017888119.

The spelling of 1396671917 in words is "one billion, three hundred ninety-six million, six hundred seventy-one thousand, nine hundred seventeen".