1280917 has 4 divisors (see below), whose sum is σ = 1397376. Its totient is φ = 1164460.

The previous prime is 1280887. The next prime is 1280921. The reversal of 1280917 is 7190821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7190821 = 11 ⋅653711.

It is not a de Polignac number, because 1280917 - 2⁷ = 1280789 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 (1280947) 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 3 ways as a sum of consecutive naturals, for example, 58213 + ... + 58234.

It is an arithmetic number, because the mean of its divisors is an integer number (349344).

2^1280917 is an apocalyptic number.

It is an amenable number.

1280917 is a deficient number, since it is larger than the sum of its proper divisors (116459).

1280917 is a wasteful number, since it uses less digits than its factorization.

1280917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116458.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 1280917 is about 1131.7760379156. The cubic root of 1280917 is about 108.6026268178.

It can be divided in two parts, 1280 and 917, that added together give a cube (2197 = 13³).

The spelling of 1280917 in words is "one million, two hundred eighty thousand, nine hundred seventeen".