3665904 has 80 divisors (see below), whose sum is σ = 10606464. Its totient is φ = 1081600.

The previous prime is 3665903. The next prime is 3665911. The reversal of 3665904 is 4095663.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3665903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27919 + ... + 28049.

Almost surely, 2^3665904 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 3665904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5303232).

3665904 is an abundant number, since it is smaller than the sum of its proper divisors (6940560).

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

3665904 is a wasteful number, since it uses less digits than its factorization.

3665904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206 (or 200 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 3665904 is about 1914.6550603177. The cubic root of 3665904 is about 154.1914748812.

The spelling of 3665904 in words is "three million, six hundred sixty-five thousand, nine hundred four".