1279939 has 4 divisors (see below), whose sum is σ = 1282320. Its totient is φ = 1277560.

The previous prime is 1279937. The next prime is 1279961. The reversal of 1279939 is 9399721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9399721 = 163 ⋅57667.

It is a cyclic number.

It is not a de Polignac number, because 1279939 - 2¹ = 1279937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1279931) 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, 42 + ... + 1600.

It is an arithmetic number, because the mean of its divisors is an integer number (320580).

2^1279939 is an apocalyptic number.

1279939 is a deficient number, since it is larger than the sum of its proper divisors (2381).

1279939 is an equidigital number, since it uses as much as digits as its factorization.

1279939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2380.

The product of its digits is 30618, while the sum is 40.

The square root of 1279939 is about 1131.3438911313. The cubic root of 1279939 is about 108.5749798502.

The spelling of 1279939 in words is "one million, two hundred seventy-nine thousand, nine hundred thirty-nine".