1279889 has 4 divisors (see below), whose sum is σ = 1378356. Its totient is φ = 1181424.

The previous prime is 1279877. The next prime is 1279907. The reversal of 1279889 is 9889721.

1279889 is nontrivially palindromic in base 12.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9889721 = 1621 ⋅6101.

It can be written as a sum of positive squares in 2 ways, for example, as 801025 + 478864 = 895^2 + 692^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1279889 is a prime.

It is a super-3 number, since 3×1279889³ = 6289819380333817107, which contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1279819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49214 + ... + 49239.

It is an arithmetic number, because the mean of its divisors is an integer number (344589).

2^1279889 is an apocalyptic number.

It is an amenable number.

1279889 is a deficient number, since it is larger than the sum of its proper divisors (98467).

1279889 is an equidigital number, since it uses as much as digits as its factorization.

1279889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98466.

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

The square root of 1279889 is about 1131.3217933020. The cubic root of 1279889 is about 108.5735660277.

The spelling of 1279889 in words is "one million, two hundred seventy-nine thousand, eight hundred eighty-nine".