3683621 has 4 divisors (see below), whose sum is σ = 3725100. Its totient is φ = 3642144.

The previous prime is 3683599. The next prime is 3683627. The reversal of 3683621 is 1263863.

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 1612900 + 2070721 = 1270^2 + 1439^2 .

It is a cyclic number.

It is not a de Polignac number, because 3683621 - 2¹⁰ = 3682597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3683627) 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, 20606 + ... + 20783.

It is an arithmetic number, because the mean of its divisors is an integer number (931275).

Almost surely, 2^3683621 is an apocalyptic number.

It is an amenable number.

3683621 is a deficient number, since it is larger than the sum of its proper divisors (41479).

3683621 is an equidigital number, since it uses as much as digits as its factorization.

3683621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41478.

The product of its digits is 5184, while the sum is 29.

The square root of 3683621 is about 1919.2761656416. The cubic root of 3683621 is about 154.4394738531.

It can be divided in two parts, 368 and 3621, that multiplied together give a triangular number (1332528 = T₁₆₃₂).

The spelling of 3683621 in words is "three million, six hundred eighty-three thousand, six hundred twenty-one".