1218685868 has 12 divisors (see below), whose sum is σ = 2258153352. Its totient is φ = 573499200.

The previous prime is 1218685807. The next prime is 1218685873. The reversal of 1218685868 is 8685868121.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8960858 + ... + 8960993.

It is an arithmetic number, because the mean of its divisors is an integer number (188179446).

Almost surely, 2^1218685868 is an apocalyptic number.

It is an amenable number.

1218685868 is a deficient number, since it is larger than the sum of its proper divisors (1039467484).

1218685868 is a wasteful number, since it uses less digits than its factorization.

1218685868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17921872 (or 17921870 counting only the distinct ones).

The product of its digits is 1474560, while the sum is 53.

The square root of 1218685868 is about 34909.6815797566. The cubic root of 1218685868 is about 1068.1459340858.

The spelling of 1218685868 in words is "one billion, two hundred eighteen million, six hundred eighty-five thousand, eight hundred sixty-eight".