1218334885 has 8 divisors (see below), whose sum is σ = 1497660696. Its totient is φ = 950895360.

The previous prime is 1218334879. The next prime is 1218334913. The reversal of 1218334885 is 5884338121.

It can be written as a sum of positive squares in 4 ways, for example, as 1790244 + 1216544641 = 1338^2 + 34879^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1218334885 - 2¹⁵ = 1218302117 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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2971344 + ... + 2971753.

It is an arithmetic number, because the mean of its divisors is an integer number (187207587).

Almost surely, 2^1218334885 is an apocalyptic number.

It is an amenable number.

1218334885 is a deficient number, since it is larger than the sum of its proper divisors (279325811).

1218334885 is an equidigital number, since it uses as much as digits as its factorization.

1218334885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5943143.

The product of its digits is 184320, while the sum is 43.

The square root of 1218334885 is about 34904.6542025559. The cubic root of 1218334885 is about 1068.0433818010.

The spelling of 1218334885 in words is "one billion, two hundred eighteen million, three hundred thirty-four thousand, eight hundred eighty-five".