7218006 has 16 divisors (see below), whose sum is σ = 14572224. Its totient is φ = 2383304.

The previous prime is 7217963. The next prime is 7218019. The reversal of 7218006 is 6008127.

It is a super-2 number, since 2×7218006² = 104199221232072, which contains 22 as substring.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4980 + ... + 6263.

It is an arithmetic number, because the mean of its divisors is an integer number (910764).

Almost surely, 2^7218006 is an apocalyptic number.

7218006 is an abundant number, since it is smaller than the sum of its proper divisors (7354218).

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

7218006 is a wasteful number, since it uses less digits than its factorization.

7218006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11355.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 7218006 is about 2686.6346979074. The cubic root of 7218006 is about 193.2587114578.

The spelling of 7218006 in words is "seven million, two hundred eighteen thousand, six".