1279387 has 8 divisors (see below), whose sum is σ = 1322496. Its totient is φ = 1237032.

The previous prime is 1279361. The next prime is 1279417. The reversal of 1279387 is 7839721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1279387 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 (1279307) 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, 7578 + ... + 7744.

It is an arithmetic number, because the mean of its divisors is an integer number (165312).

2^1279387 is an apocalyptic number.

1279387 is a deficient number, since it is larger than the sum of its proper divisors (43109).

1279387 is a wasteful number, since it uses less digits than its factorization.

1279387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377.

The product of its digits is 21168, while the sum is 37.

The square root of 1279387 is about 1131.0999071700. The cubic root of 1279387 is about 108.5593692087.

It can be divided in two parts, 12793 and 87, that added together give a triangular number (12880 = T₁₆₀).

The spelling of 1279387 in words is "one million, two hundred seventy-nine thousand, three hundred eighty-seven".