1296139 has 8 divisors (see below), whose sum is σ = 1406160. Its totient is φ = 1187616.

The previous prime is 1296137. The next prime is 1296143. The reversal of 1296139 is 9316921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1296139 - 2¹ = 1296137 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1296139.

It is not an unprimeable number, because it can be changed into a prime (1296137) 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 7 ways as a sum of consecutive naturals, for example, 2049 + ... + 2605.

It is an arithmetic number, because the mean of its divisors is an integer number (175770).

2^1296139 is an apocalyptic number.

1296139 is a deficient number, since it is larger than the sum of its proper divisors (110021).

1296139 is a wasteful number, since it uses less digits than its factorization.

1296139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749.

The product of its digits is 2916, while the sum is 31.

The square root of 1296139 is about 1138.4810055508. The cubic root of 1296139 is about 109.0311332664.

The spelling of 1296139 in words is "one million, two hundred ninety-six thousand, one hundred thirty-nine".