1317905 has 16 divisors (see below), whose sum is σ = 1674000. Its totient is φ = 994560.

The previous prime is 1317887. The next prime is 1317917. The reversal of 1317905 is 5097131.

It is a Cunningham number, because it is equal to 1148²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 394384 + 923521 = 628^2 + 961^2 .

It is not a de Polignac number, because 1317905 - 2¹⁰ = 1316881 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8771 + ... + 8919.

It is an arithmetic number, because the mean of its divisors is an integer number (104625).

2^1317905 is an apocalyptic number.

It is an amenable number.

1317905 is a deficient number, since it is larger than the sum of its proper divisors (356095).

1317905 is a wasteful number, since it uses less digits than its factorization.

1317905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244.

The product of its (nonzero) digits is 945, while the sum is 26.

The square root of 1317905 is about 1148.0004355400. Note that the first 3 decimals coincide. The cubic root of 1317905 is about 109.6380666339.

It can be divided in two parts, 1317 and 905, that added together give a palindrome (2222).

The spelling of 1317905 in words is "one million, three hundred seventeen thousand, nine hundred five".