1272805 has 8 divisors (see below), whose sum is σ = 1546272. Its totient is φ = 1005648.

The previous prime is 1272749. The next prime is 1272811. The reversal of 1272805 is 5082721.

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 1272805 - 2¹¹ = 1270757 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 1272805.

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 7 ways as a sum of consecutive naturals, for example, 1119 + ... + 1948.

It is an arithmetic number, because the mean of its divisors is an integer number (193284).

2^1272805 is an apocalyptic number.

It is an amenable number.

1272805 is a deficient number, since it is larger than the sum of its proper divisors (273467).

1272805 is an equidigital number, since it uses as much as digits as its factorization.

1272805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3155.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 1272805 is about 1128.1865980413. The cubic root of 1272805 is about 108.3728823386.

The spelling of 1272805 in words is "one million, two hundred seventy-two thousand, eight hundred five".