1218798873 has 16 divisors (see below), whose sum is σ = 1806398400. Its totient is φ = 812185920.

The previous prime is 1218798857. The next prime is 1218798887. The reversal of 1218798873 is 3788978121.

It is a happy number.

It is not a de Polignac number, because 1218798873 - 2⁴ = 1218798857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1218798803) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 65473 + ... + 82001.

It is an arithmetic number, because the mean of its divisors is an integer number (112899900).

Almost surely, 2^1218798873 is an apocalyptic number.

It is an amenable number.

1218798873 is a deficient number, since it is larger than the sum of its proper divisors (587599527).

1218798873 is a wasteful number, since it uses less digits than its factorization.

1218798873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19269 (or 19263 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 54.

The square root of 1218798873 is about 34911.3000760499. The cubic root of 1218798873 is about 1068.1789483634.

The spelling of 1218798873 in words is "one billion, two hundred eighteen million, seven hundred ninety-eight thousand, eight hundred seventy-three".