1218587 has 4 divisors (see below), whose sum is σ = 1223040. Its totient is φ = 1214136.

The previous prime is 1218583. The next prime is 1218601. The reversal of 1218587 is 7858121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7858121 = 43 ⋅182747.

It is a cyclic number.

It is not a de Polignac number, because 1218587 - 2² = 1218583 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1218583) 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, 1787 + ... + 2372.

It is an arithmetic number, because the mean of its divisors is an integer number (305760).

2^1218587 is an apocalyptic number.

1218587 is a deficient number, since it is larger than the sum of its proper divisors (4453).

1218587 is an equidigital number, since it uses as much as digits as its factorization.

1218587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4452.

The product of its digits is 4480, while the sum is 32.

The square root of 1218587 is about 1103.8962813598. The cubic root of 1218587 is about 106.8117048242.

The spelling of 1218587 in words is "one million, two hundred eighteen thousand, five hundred eighty-seven".