1279645 has 8 divisors (see below), whose sum is σ = 1577304. Its totient is φ = 995904.

The previous prime is 1279643. The next prime is 1279657. The reversal of 1279645 is 5469721.

It can be written as a sum of positive squares in 4 ways, for example, as 436921 + 842724 = 661^2 + 918^2 .

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 1279645 - 2¹ = 1279643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1279645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1279643) 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, 3274 + ... + 3643.

It is an arithmetic number, because the mean of its divisors is an integer number (197163).

2^1279645 is an apocalyptic number.

It is an amenable number.

1279645 is a deficient number, since it is larger than the sum of its proper divisors (297659).

1279645 is an equidigital number, since it uses as much as digits as its factorization.

1279645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6959.

The product of its digits is 15120, while the sum is 34.

The square root of 1279645 is about 1131.2139497018. The cubic root of 1279645 is about 108.5666660455.

The spelling of 1279645 in words is "one million, two hundred seventy-nine thousand, six hundred forty-five".