1218986 has 8 divisors (see below), whose sum is σ = 1891620. Its totient is φ = 588448.

The previous prime is 1218953. The next prime is 1218989. The reversal of 1218986 is 6898121.

It can be written as a sum of positive squares in 2 ways, for example, as 1062961 + 156025 = 1031^2 + 395^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (1218989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10451 + ... + 10566.

2^1218986 is an apocalyptic number.

1218986 is a deficient number, since it is larger than the sum of its proper divisors (672634).

1218986 is a wasteful number, since it uses less digits than its factorization.

1218986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21048.

The product of its digits is 6912, while the sum is 35.

The square root of 1218986 is about 1104.0769900691. The cubic root of 1218986 is about 106.8233612809.

The spelling of 1218986 in words is "one million, two hundred eighteen thousand, nine hundred eighty-six".