3665718 has 48 divisors (see below), whose sum is σ = 9285120. Its totient is φ = 1023408.

The previous prime is 3665677. The next prime is 3665731. The reversal of 3665718 is 8175663.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5613 + ... + 6231.

It is an arithmetic number, because the mean of its divisors is an integer number (193440).

Almost surely, 2^3665718 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3665718, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4642560).

3665718 is an abundant number, since it is smaller than the sum of its proper divisors (5619402).

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

3665718 is a wasteful number, since it uses less digits than its factorization.

3665718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681 (or 678 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 3665718 is about 1914.6064869837. The cubic root of 3665718 is about 154.1888670570.

It can be divided in two parts, 366 and 5718, that added together give a square (6084 = 78²).

The spelling of 3665718 in words is "three million, six hundred sixty-five thousand, seven hundred eighteen".