3684861 has 6 divisors (see below), whose sum is σ = 5322590. Its totient is φ = 2456568.

The previous prime is 3684859. The next prime is 3684871. The reversal of 3684861 is 1684863.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2722500 + 962361 = 1650^2 + 981^2 .

It is not a de Polignac number, because 3684861 - 2¹ = 3684859 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 (3684871) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 204706 + ... + 204723.

Almost surely, 2^3684861 is an apocalyptic number.

It is an amenable number.

3684861 is a deficient number, since it is larger than the sum of its proper divisors (1637729).

3684861 is a wasteful number, since it uses less digits than its factorization.

3684861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409435 (or 409432 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 3684861 is about 1919.5991769117. The cubic root of 3684861 is about 154.4568013201.

The spelling of 3684861 in words is "three million, six hundred eighty-four thousand, eight hundred sixty-one".