1389917 has 2 divisors, whose sum is σ = 1389918. Its totient is φ = 1389916.

The previous prime is 1389911. The next prime is 1389919. The reversal of 1389917 is 7199831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1125721 + 264196 = 1061^2 + 514^2 .

It is a cyclic number.

It is not a de Polignac number, because 1389917 - 2⁶ = 1389853 is a prime.

Together with 1389919, 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 (1389911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694958 + 694959.

It is an arithmetic number, because the mean of its divisors is an integer number (694959).

2^1389917 is an apocalyptic number.

It is an amenable number.

1389917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389917 is an equidigital number, since it uses as much as digits as its factorization.

1389917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 38.

The square root of 1389917 is about 1178.9474118891. The cubic root of 1389917 is about 111.5996816150.

The spelling of 1389917 in words is "one million, three hundred eighty-nine thousand, nine hundred seventeen".