7218845 has 8 divisors (see below), whose sum is σ = 8709120. Its totient is φ = 5744080.

The previous prime is 7218839. The next prime is 7218853. The reversal of 7218845 is 5488127.

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

It is not a de Polignac number, because 7218845 - 2¹⁶ = 7153309 is a prime.

It is a super-2 number, since 2×7218845² = 104223446268050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 2825 + ... + 4734.

It is an arithmetic number, because the mean of its divisors is an integer number (1088640).

Almost surely, 2^7218845 is an apocalyptic number.

It is an amenable number.

7218845 is a deficient number, since it is larger than the sum of its proper divisors (1490275).

7218845 is a wasteful number, since it uses less digits than its factorization.

7218845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7755.

The product of its digits is 17920, while the sum is 35.

The square root of 7218845 is about 2686.7908366674. The cubic root of 7218845 is about 193.2661991110.

The spelling of 7218845 in words is "seven million, two hundred eighteen thousand, eight hundred forty-five".