1289879 has 4 divisors (see below), whose sum is σ = 1331520. Its totient is φ = 1248240.

The previous prime is 1289867. The next prime is 1289881. The reversal of 1289879 is 9789821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9789821 = 883 ⋅11087.

It is a cyclic number.

It is not a de Polignac number, because 1289879 - 2⁸ = 1289623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289839) 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, 20774 + ... + 20835.

It is an arithmetic number, because the mean of its divisors is an integer number (332880).

2^1289879 is an apocalyptic number.

1289879 is a deficient number, since it is larger than the sum of its proper divisors (41641).

1289879 is an equidigital number, since it uses as much as digits as its factorization.

1289879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41640.

The product of its digits is 72576, while the sum is 44.

The square root of 1289879 is about 1135.7284006311. The cubic root of 1289879 is about 108.8553196457.

The spelling of 1289879 in words is "one million, two hundred eighty-nine thousand, eight hundred seventy-nine".