1218388872 has 32 divisors (see below), whose sum is σ = 3082675680. Its totient is φ = 401235840.

The previous prime is 1218388859. The next prime is 1218388891. The reversal of 1218388872 is 2788838121.

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 7 ways as a sum of consecutive naturals, for example, 303829 + ... + 307812.

It is an arithmetic number, because the mean of its divisors is an integer number (96333615).

Almost surely, 2^1218388872 is an apocalyptic number.

1218388872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1218388872 is an abundant number, since it is smaller than the sum of its proper divisors (1864286808).

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

1218388872 is a wasteful number, since it uses less digits than its factorization.

1218388872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611733 (or 611729 counting only the distinct ones).

The product of its digits is 344064, while the sum is 48.

The square root of 1218388872 is about 34905.4275435784. The cubic root of 1218388872 is about 1068.0591573230.

The spelling of 1218388872 in words is "one billion, two hundred eighteen million, three hundred eighty-eight thousand, eight hundred seventy-two".