1399139 has 4 divisors (see below), whose sum is σ = 1599024. Its totient is φ = 1199256.

The previous prime is 1399133. The next prime is 1399183. The reversal of 1399139 is 9319931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9319931 = 263 ⋅35437.

It is a cyclic number.

It is not a de Polignac number, because 1399139 - 2²⁰ = 350563 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1399099 and 1399108.

It is not an unprimeable number, because it can be changed into a prime (1399133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99932 + ... + 99945.

It is an arithmetic number, because the mean of its divisors is an integer number (399756).

2^1399139 is an apocalyptic number.

1399139 is a deficient number, since it is larger than the sum of its proper divisors (199885).

1399139 is an equidigital number, since it uses as much as digits as its factorization.

1399139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199884.

The product of its digits is 6561, while the sum is 35.

The square root of 1399139 is about 1182.8520617558. The cubic root of 1399139 is about 111.8459563819.

The spelling of 1399139 in words is "one million, three hundred ninety-nine thousand, one hundred thirty-nine".