1218478833 has 36 divisors (see below), whose sum is σ = 2083410420. Its totient is φ = 681658560.

The previous prime is 1218478801. The next prime is 1218478837. The reversal of 1218478833 is 3388748121.

It can be written as a sum of positive squares in 2 ways, for example, as 304746849 + 913731984 = 17457^2 + 30228^2 .

It is not a de Polignac number, because 1218478833 - 2⁵ = 1218478801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1218478837) 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 35 ways as a sum of consecutive naturals, for example, 28878 + ... + 57191.

Almost surely, 2^1218478833 is an apocalyptic number.

1218478833 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1218478833 is a deficient number, since it is larger than the sum of its proper divisors (864931587).

1218478833 is a wasteful number, since it uses less digits than its factorization.

1218478833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86110 (or 86096 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 1218478833 is about 34906.7161589285. The cubic root of 1218478833 is about 1068.0854437595.

The spelling of 1218478833 in words is "one billion, two hundred eighteen million, four hundred seventy-eight thousand, eight hundred thirty-three".