7218165 has 8 divisors (see below), whose sum is σ = 11549088. Its totient is φ = 3849680.

The previous prime is 7218161. The next prime is 7218179. The reversal of 7218165 is 5618127.

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

It is not a de Polignac number, because 7218165 - 2² = 7218161 is a prime.

It is an alternating number because its digits alternate between odd and even.

7218165 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7218161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240591 + ... + 240620.

It is an arithmetic number, because the mean of its divisors is an integer number (1443636).

Almost surely, 2^7218165 is an apocalyptic number.

It is an amenable number.

7218165 is a deficient number, since it is larger than the sum of its proper divisors (4330923).

7218165 is a wasteful number, since it uses less digits than its factorization.

7218165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481219.

The product of its digits is 3360, while the sum is 30.

The square root of 7218165 is about 2686.6642886673. The cubic root of 7218165 is about 193.2601304974.

The spelling of 7218165 in words is "seven million, two hundred eighteen thousand, one hundred sixty-five".