1218889 has 16 divisors (see below), whose sum is σ = 1483776. Its totient is φ = 979200.

The previous prime is 1218859. The next prime is 1218901. The reversal of 1218889 is 9888121.

1218889 = 32² + 33² + ... + 154².

It is a cyclic number.

It is not a de Polignac number, because 1218889 - 2⁷ = 1218761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1218829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8829 + ... + 8965.

It is an arithmetic number, because the mean of its divisors is an integer number (92736).

2^1218889 is an apocalyptic number.

It is an amenable number.

1218889 is a deficient number, since it is larger than the sum of its proper divisors (264887).

1218889 is a wasteful number, since it uses less digits than its factorization.

1218889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216.

The product of its digits is 9216, while the sum is 37.

The square root of 1218889 is about 1104.0330610992. The cubic root of 1218889 is about 106.8205277397.

The spelling of 1218889 in words is "one million, two hundred eighteen thousand, eight hundred eighty-nine".