7218215 has 8 divisors (see below), whose sum is σ = 8784288. Its totient is φ = 5692960.

The previous prime is 7218209. The next prime is 7218221. The reversal of 7218215 is 5128127.

It is an interprime number because it is at equal distance from previous prime (7218209) and next prime (7218221).

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

It is not a de Polignac number, because 7218215 - 2⁴ = 7218199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 9812 + ... + 10521.

It is an arithmetic number, because the mean of its divisors is an integer number (1098036).

Almost surely, 2^7218215 is an apocalyptic number.

7218215 is a deficient number, since it is larger than the sum of its proper divisors (1566073).

7218215 is a wasteful number, since it uses less digits than its factorization.

7218215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20409.

The product of its digits is 1120, while the sum is 26.

The square root of 7218215 is about 2686.6735938703. The cubic root of 7218215 is about 193.2605767320.

The spelling of 7218215 in words is "seven million, two hundred eighteen thousand, two hundred fifteen".