1218849618 has 48 divisors (see below), whose sum is σ = 2863836864. Its totient is φ = 344786400.

The previous prime is 1218849551. The next prime is 1218849623. The reversal of 1218849618 is 8169488121.

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, 9171 + ... + 50217.

It is an arithmetic number, because the mean of its divisors is an integer number (59663268).

Almost surely, 2^1218849618 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1218849618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1431918432).

1218849618 is an abundant number, since it is smaller than the sum of its proper divisors (1644987246).

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

1218849618 is a wasteful number, since it uses less digits than its factorization.

1218849618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41167 (or 41160 counting only the distinct ones).

The product of its digits is 221184, while the sum is 48.

The square root of 1218849618 is about 34912.0268388989. The cubic root of 1218849618 is about 1068.1937727914.

The spelling of 1218849618 in words is "one billion, two hundred eighteen million, eight hundred forty-nine thousand, six hundred eighteen".