1218664 has 16 divisors (see below), whose sum is σ = 2296800. Its totient is φ = 606192.

The previous prime is 1218653. The next prime is 1218683. The reversal of 1218664 is 4668121.

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, 2557 + ... + 2995.

It is an arithmetic number, because the mean of its divisors is an integer number (143550).

2^1218664 is an apocalyptic number.

It is an amenable number.

1218664 is a deficient number, since it is larger than the sum of its proper divisors (1078136).

1218664 is a wasteful number, since it uses less digits than its factorization.

1218664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792 (or 788 counting only the distinct ones).

The product of its digits is 2304, while the sum is 28.

The square root of 1218664 is about 1103.9311572739. The cubic root of 1218664 is about 106.8139545140.

The spelling of 1218664 in words is "one million, two hundred eighteen thousand, six hundred sixty-four".