1399679 has 2 divisors, whose sum is σ = 1399680. Its totient is φ = 1399678.

The previous prime is 1399663. The next prime is 1399687. The reversal of 1399679 is 9769931.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1399679 - 2⁴ = 1399663 is a prime.

It is an Ulam number.

It is a plaindrome in base 6.

It is a nialpdrome in base 11.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1399609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699839 + 699840.

It is an arithmetic number, because the mean of its divisors is an integer number (699840).

2^1399679 is an apocalyptic number.

1399679 is a deficient number, since it is larger than the sum of its proper divisors (1).

1399679 is an equidigital number, since it uses as much as digits as its factorization.

1399679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 91854, while the sum is 44.

The square root of 1399679 is about 1183.0803015857. The cubic root of 1399679 is about 111.8603435748.

The spelling of 1399679 in words is "one million, three hundred ninety-nine thousand, six hundred seventy-nine".