3684821 has 8 divisors (see below), whose sum is σ = 4269504. Its totient is φ = 3114720.

The previous prime is 3684809. The next prime is 3684833. The reversal of 3684821 is 1284863.

3684821 is digitally balanced in base 8, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (3684809) and next prime (3684833).

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

It is not a de Polignac number, because 3684821 - 2⁶ = 3684757 is a prime.

It is an Ulam number.

It is a Duffinian number.

3684821 is strictly pandigital in base 8.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3684871) 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, 3095 + ... + 4116.

It is an arithmetic number, because the mean of its divisors is an integer number (533688).

Almost surely, 2^3684821 is an apocalyptic number.

It is an amenable number.

3684821 is a deficient number, since it is larger than the sum of its proper divisors (584683).

3684821 is an equidigital number, since it uses as much as digits as its factorization.

3684821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7291.

The product of its digits is 9216, while the sum is 32.

The square root of 3684821 is about 1919.5887580417. The cubic root of 3684821 is about 154.4562424302.

The spelling of 3684821 in words is "three million, six hundred eighty-four thousand, eight hundred twenty-one".