1218005 has 16 divisors (see below), whose sum is σ = 1534464. Its totient is φ = 927360.

The previous prime is 1217989. The next prime is 1218017. The reversal of 1218005 is 5008121.

It is not a de Polignac number, because 1218005 - 2⁴ = 1217989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 16649 + ... + 16721.

It is an arithmetic number, because the mean of its divisors is an integer number (95904).

2^1218005 is an apocalyptic number.

It is an amenable number.

1218005 is a deficient number, since it is larger than the sum of its proper divisors (316459).

1218005 is an equidigital number, since it uses as much as digits as its factorization.

1218005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 1218005 is about 1103.6326381546. The cubic root of 1218005 is about 106.7946976097.

The spelling of 1218005 in words is "one million, two hundred eighteen thousand, five".