2218506 has 8 divisors (see below), whose sum is σ = 4437024. Its totient is φ = 739500.

The previous prime is 2218451. The next prime is 2218519. The reversal of 2218506 is 6058122.

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

2218506 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184870 + ... + 184881.

It is an arithmetic number, because the mean of its divisors is an integer number (554628).

2^2218506 is an apocalyptic number.

2218506 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2218506 is a wasteful number, since it uses less digits than its factorization.

2218506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369756.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 2218506 is about 1489.4650046241. The cubic root of 2218506 is about 130.4228048615.

It can be divided in two parts, 22 and 18506, that added together give a triangular number (18528 = T₁₉₂).

The spelling of 2218506 in words is "two million, two hundred eighteen thousand, five hundred six".