3688521 has 8 divisors (see below), whose sum is σ = 4987584. Its totient is φ = 2424240.

The previous prime is 3688519. The next prime is 3688537. The reversal of 3688521 is 1258863.

It is a happy number.

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

It is not a de Polignac number, because 3688521 - 2¹ = 3688519 is a prime.

It is a super-4 number, since 4×3688521⁴ (a number of 27 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (3688501) 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, 8446 + ... + 8871.

It is an arithmetic number, because the mean of its divisors is an integer number (623448).

Almost surely, 2^3688521 is an apocalyptic number.

It is an amenable number.

3688521 is a deficient number, since it is larger than the sum of its proper divisors (1299063).

3688521 is a wasteful number, since it uses less digits than its factorization.

3688521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17391.

The product of its digits is 11520, while the sum is 33.

The square root of 3688521 is about 1920.5522643240. The cubic root of 3688521 is about 154.5079226360.

The spelling of 3688521 in words is "three million, six hundred eighty-eight thousand, five hundred twenty-one".