2218909 has 8 divisors (see below), whose sum is σ = 2766528. Its totient is φ = 1728960.

The previous prime is 2218907. The next prime is 2218933. The reversal of 2218909 is 9098122.

2218909 = 35² + 36² + ... + 188².

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

It is a cyclic number.

It is not a de Polignac number, because 2218909 - 2¹ = 2218907 is a prime.

It is a Duffinian number.

2218909 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2218901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14332 + ... + 14485.

It is an arithmetic number, because the mean of its divisors is an integer number (345816).

2^2218909 is an apocalyptic number.

It is an amenable number.

2218909 is a deficient number, since it is larger than the sum of its proper divisors (547619).

2218909 is a wasteful number, since it uses less digits than its factorization.

2218909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28835.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 2218909 is about 1489.6002819549. The cubic root of 2218909 is about 130.4307016485.

The spelling of 2218909 in words is "two million, two hundred eighteen thousand, nine hundred nine".