1399817 has 2 divisors, whose sum is σ = 1399818. Its totient is φ = 1399816.

The previous prime is 1399813. The next prime is 1399819. The reversal of 1399817 is 7189931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 942841 + 456976 = 971^2 + 676^2 .

It is a cyclic number.

It is not a de Polignac number, because 1399817 - 2² = 1399813 is a prime.

Together with 1399819, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1399813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699908 + 699909.

It is an arithmetic number, because the mean of its divisors is an integer number (699909).

2^1399817 is an apocalyptic number.

It is an amenable number.

1399817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1399817 is an equidigital number, since it uses as much as digits as its factorization.

1399817 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1399817 is about 1183.1386224784. The cubic root of 1399817 is about 111.8640197082.

The spelling of 1399817 in words is "one million, three hundred ninety-nine thousand, eight hundred seventeen".