1218875994 has 48 divisors (see below), whose sum is σ = 3020314752. Its totient is φ = 348002784.

The previous prime is 1218875989. The next prime is 1218876019. The reversal of 1218875994 is 4995788121.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1218875994.

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 23 ways as a sum of consecutive naturals, for example, 246147 + ... + 251049.

It is an arithmetic number, because the mean of its divisors is an integer number (62923224).

Almost surely, 2^1218875994 is an apocalyptic number.

1218875994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1218875994 is an abundant number, since it is smaller than the sum of its proper divisors (1801438758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1218875994 is a wasteful number, since it uses less digits than its factorization.

1218875994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6891 (or 6888 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 54.

The square root of 1218875994 is about 34912.4045863358. The cubic root of 1218875994 is about 1068.2014780011.

The spelling of 1218875994 in words is "one billion, two hundred eighteen million, eight hundred seventy-five thousand, nine hundred ninety-four".