1399039 has 2 divisors, whose sum is σ = 1399040. Its totient is φ = 1399038.

The previous prime is 1399037. The next prime is 1399063. The reversal of 1399039 is 9309931.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1399039 - 2¹ = 1399037 is a prime.

Together with 1399037, it forms a pair of twin primes.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 1398995 and 1399013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1399033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699519 + 699520.

It is an arithmetic number, because the mean of its divisors is an integer number (699520).

2^1399039 is an apocalyptic number.

1399039 is a deficient number, since it is larger than the sum of its proper divisors (1).

1399039 is an equidigital number, since it uses as much as digits as its factorization.

1399039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6561, while the sum is 34.

The square root of 1399039 is about 1182.8097902875. The cubic root of 1399039 is about 111.8432916807.

The spelling of 1399039 in words is "one million, three hundred ninety-nine thousand, thirty-nine".