1217005 has 4 divisors (see below), whose sum is σ = 1460412. Its totient is φ = 973600.

The previous prime is 1216997. The next prime is 1217009. The reversal of 1217005 is 5007121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5007121 = 7 ⋅715303.

It can be written as a sum of positive squares in 2 ways, for example, as 492804 + 724201 = 702^2 + 851^2 .

It is not a de Polignac number, because 1217005 - 2³ = 1216997 is a prime.

It is a super-2 number, since 2×1217005² = 2962202340050, which contains 22 as substring.

It is a Duffinian number.

1217005 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1217005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217009) 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, 121696 + ... + 121705.

It is an arithmetic number, because the mean of its divisors is an integer number (365103).

2^1217005 is an apocalyptic number.

It is an amenable number.

1217005 is a deficient number, since it is larger than the sum of its proper divisors (243407).

1217005 is an equidigital number, since it uses as much as digits as its factorization.

1217005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243406.

The product of its (nonzero) digits is 70, while the sum is 16.

The square root of 1217005 is about 1103.1794958211. The cubic root of 1217005 is about 106.7654629356.

The spelling of 1217005 in words is "one million, two hundred seventeen thousand, five".