1272779 has 4 divisors (see below), whose sum is σ = 1281360. Its totient is φ = 1264200.

The previous prime is 1272749. The next prime is 1272811. The reversal of 1272779 is 9772721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9772721 = 7 ⋅1396103.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1272779 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 (1272749) by changing a digit.

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, 4064 + ... + 4365.

It is an arithmetic number, because the mean of its divisors is an integer number (320340).

2^1272779 is an apocalyptic number.

1272779 is a deficient number, since it is larger than the sum of its proper divisors (8581).

1272779 is an equidigital number, since it uses as much as digits as its factorization.

1272779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8580.

The product of its digits is 12348, while the sum is 35.

The square root of 1272779 is about 1128.1750750659. The cubic root of 1272779 is about 108.3721444109.

The spelling of 1272779 in words is "one million, two hundred seventy-two thousand, seven hundred seventy-nine".