3688217 has 12 divisors (see below), whose sum is σ = 4088364. Its totient is φ = 3307200.

The previous prime is 3688199. The next prime is 3688219. The reversal of 3688217 is 7128863.

It can be written as a sum of positive squares in 6 ways, for example, as 379456 + 3308761 = 616^2 + 1819^2 .

It is a de Polignac number, because none of the positive numbers 2^k-3688217 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3688219) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36467 + ... + 36567.

It is an arithmetic number, because the mean of its divisors is an integer number (340697).

Almost surely, 2^3688217 is an apocalyptic number.

It is an amenable number.

3688217 is a deficient number, since it is larger than the sum of its proper divisors (400147).

3688217 is a wasteful number, since it uses less digits than its factorization.

3688217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220 (or 167 counting only the distinct ones).

The product of its digits is 16128, while the sum is 35.

The square root of 3688217 is about 1920.4731187913. The cubic root of 3688217 is about 154.5036777820.

The spelling of 3688217 in words is "three million, six hundred eighty-eight thousand, two hundred seventeen".