1279742 has 8 divisors (see below), whose sum is σ = 1981632. Its totient is φ = 619200.

The previous prime is 1279727. The next prime is 1279753. The reversal of 1279742 is 2479721.

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

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1279699 and 1279708.

It is a congruent number.

It is an unprimeable number.

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, 10259 + ... + 10382.

It is an arithmetic number, because the mean of its divisors is an integer number (247704).

2^1279742 is an apocalyptic number.

1279742 is a deficient number, since it is larger than the sum of its proper divisors (701890).

1279742 is a wasteful number, since it uses less digits than its factorization.

1279742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20674.

The product of its digits is 7056, while the sum is 32.

The square root of 1279742 is about 1131.2568231838. The cubic root of 1279742 is about 108.5694091763.

The spelling of 1279742 in words is "one million, two hundred seventy-nine thousand, seven hundred forty-two".