1279979 has 4 divisors (see below), whose sum is σ = 1311240. Its totient is φ = 1248720.

The previous prime is 1279969. The next prime is 1279997. The reversal of 1279979 is 9799721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9799721 = 1601 ⋅6121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1279979 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1279919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15569 + ... + 15650.

It is an arithmetic number, because the mean of its divisors is an integer number (327810).

2^1279979 is an apocalyptic number.

1279979 is a deficient number, since it is larger than the sum of its proper divisors (31261).

1279979 is an equidigital number, since it uses as much as digits as its factorization.

1279979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31260.

The product of its digits is 71442, while the sum is 44.

The square root of 1279979 is about 1131.3615690839. The cubic root of 1279979 is about 108.5761108817.

The spelling of 1279979 in words is "one million, two hundred seventy-nine thousand, nine hundred seventy-nine".