3665844 has 96 divisors (see below), whose sum is σ = 11728640. Its totient is φ = 964224.

The previous prime is 3665839. The next prime is 3665869. The reversal of 3665844 is 4485663.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a d-powerful number, because it can be written as 3² + 6 + 6⁸ + 5⁹ + 8⁵ + 4³ + 4⁴ .

It is a junction number, because it is equal to n+sod(n) for n = 3665799 and 3665808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9642 + ... + 10014.

Almost surely, 2^3665844 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3665844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5864320).

3665844 is an abundant number, since it is smaller than the sum of its proper divisors (8062796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3665844 is a wasteful number, since it uses less digits than its factorization.

3665844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406 (or 398 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 3665844 is about 1914.6393916349. The cubic root of 3665844 is about 154.1906336572.

The spelling of 3665844 in words is "three million, six hundred sixty-five thousand, eight hundred forty-four".