1218549918 has 32 divisors (see below), whose sum is σ = 2491430400. Its totient is φ = 397145600.

The previous prime is 1218549907. The next prime is 1218549923. The reversal of 1218549918 is 8199458121.

It is a happy 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 15 ways as a sum of consecutive naturals, for example, 450133 + ... + 452831.

It is an arithmetic number, because the mean of its divisors is an integer number (77857200).

Almost surely, 2^1218549918 is an apocalyptic number.

1218549918 is an abundant number, since it is smaller than the sum of its proper divisors (1272880482).

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

1218549918 is a wasteful number, since it uses less digits than its factorization.

1218549918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4352.

The product of its digits is 207360, while the sum is 48.

The square root of 1218549918 is about 34907.7343578755. The cubic root of 1218549918 is about 1068.1062137489.

The spelling of 1218549918 in words is "one billion, two hundred eighteen million, five hundred forty-nine thousand, nine hundred eighteen".