3680521 has 4 divisors (see below), whose sum is σ = 3963652. Its totient is φ = 3397392.

The previous prime is 3680519. The next prime is 3680527. The reversal of 3680521 is 1250863.

It is a happy number.

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 2325625 + 1354896 = 1525^2 + 1164^2 .

It is a cyclic number.

It is not a de Polignac number, because 3680521 - 2¹ = 3680519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3680527) 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, 141546 + ... + 141571.

It is an arithmetic number, because the mean of its divisors is an integer number (990913).

Almost surely, 2^3680521 is an apocalyptic number.

It is an amenable number.

3680521 is a deficient number, since it is larger than the sum of its proper divisors (283131).

3680521 is a wasteful number, since it uses less digits than its factorization.

3680521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283130.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 3680521 is about 1918.4683995313. The cubic root of 3680521 is about 154.3961381666.

The spelling of 3680521 in words is "three million, six hundred eighty thousand, five hundred twenty-one".