3918217 has 4 divisors (see below), whose sum is σ = 3927700. Its totient is φ = 3908736.

The previous prime is 3918209. The next prime is 3918251. The reversal of 3918217 is 7128193.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1798281 + 2119936 = 1341^2 + 1456^2 .

It is a cyclic number.

It is not a de Polignac number, because 3918217 - 2³ = 3918209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3912217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4092 + ... + 4957.

It is an arithmetic number, because the mean of its divisors is an integer number (981925).

Almost surely, 2^3918217 is an apocalyptic number.

It is an amenable number.

3918217 is a deficient number, since it is larger than the sum of its proper divisors (9483).

3918217 is an equidigital number, since it uses as much as digits as its factorization.

3918217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9482.

The product of its digits is 3024, while the sum is 31.

The square root of 3918217 is about 1979.4486606123. The cubic root of 3918217 is about 157.6507936846.

Subtracting from 3918217 its product of digits (3024), we obtain a palindrome (3915193).

The spelling of 3918217 in words is "three million, nine hundred eighteen thousand, two hundred seventeen".