1299139 has 4 divisors (see below), whose sum is σ = 1311856. Its totient is φ = 1286424.

The previous prime is 1299101. The next prime is 1299143. The reversal of 1299139 is 9319921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9319921 = 13 ⋅716917.

It is a cyclic number.

It is not a de Polignac number, because 1299139 - 2¹¹ = 1297091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1299169) 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, 6204 + ... + 6409.

It is an arithmetic number, because the mean of its divisors is an integer number (327964).

2^1299139 is an apocalyptic number.

1299139 is a deficient number, since it is larger than the sum of its proper divisors (12717).

1299139 is a wasteful number, since it uses less digits than its factorization.

1299139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12716.

The product of its digits is 4374, while the sum is 34.

The square root of 1299139 is about 1139.7977890837. The cubic root of 1299139 is about 109.1151883881.

The spelling of 1299139 in words is "one million, two hundred ninety-nine thousand, one hundred thirty-nine".