1218009 has 8 divisors (see below), whose sum is σ = 1748992. Its totient is φ = 749520.

The previous prime is 1217989. The next prime is 1218017. The reversal of 1218009 is 9008121.

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

It is not a de Polignac number, because 1218009 - 2⁵ = 1217977 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1218089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15577 + ... + 15654.

It is an arithmetic number, because the mean of its divisors is an integer number (218624).

2^1218009 is an apocalyptic number.

It is an amenable number.

1218009 is a deficient number, since it is larger than the sum of its proper divisors (530983).

1218009 is a wasteful number, since it uses less digits than its factorization.

1218009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31247.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 1218009 is about 1103.6344503503. The cubic root of 1218009 is about 106.7948145163.

The spelling of 1218009 in words is "one million, two hundred eighteen thousand, nine".