1279389 has 8 divisors (see below), whose sum is σ = 1712160. Its totient is φ = 849776.

The previous prime is 1279361. The next prime is 1279417. The reversal of 1279389 is 9839721.

It is an interprime number because it is at equal distance from previous prime (1279361) and next prime (1279417).

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 1279389 - 2⁵ = 1279357 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1279309) 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, 427 + ... + 1655.

It is an arithmetic number, because the mean of its divisors is an integer number (214020).

2^1279389 is an apocalyptic number.

It is an amenable number.

1279389 is a deficient number, since it is larger than the sum of its proper divisors (432771).

1279389 is a wasteful number, since it uses less digits than its factorization.

1279389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1579.

The product of its digits is 27216, while the sum is 39.

The square root of 1279389 is about 1131.1007912649. The cubic root of 1279389 is about 108.5594257771.

It can be divided in two parts, 12 and 79389, that added together give a triangular number (79401 = T₃₉₈).

The spelling of 1279389 in words is "one million, two hundred seventy-nine thousand, three hundred eighty-nine".