3643685 has 8 divisors (see below), whose sum is σ = 4411800. Its totient is φ = 2888704.

The previous prime is 3643681. The next prime is 3643699. The reversal of 3643685 is 5863463.

It can be written as a sum of positive squares in 4 ways, for example, as 320356 + 3323329 = 566^2 + 1823^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 3643685 - 2² = 3643681 is a prime.

It is a d-powerful number, because it can be written as 3⁵ + 6² + 4⁶ + 3⁸ + 6⁸ + 8 + 5⁹ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3643681) 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, 2660 + ... + 3789.

It is an arithmetic number, because the mean of its divisors is an integer number (551475).

Almost surely, 2^3643685 is an apocalyptic number.

It is an amenable number.

3643685 is a deficient number, since it is larger than the sum of its proper divisors (768115).

3643685 is a wasteful number, since it uses less digits than its factorization.

3643685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6567.

The product of its digits is 51840, while the sum is 35.

The square root of 3643685 is about 1908.8438909455. The cubic root of 3643685 is about 153.8793258278.

Subtracting from 3643685 its sum of digits (35), we obtain a triangular number (3643650 = T₂₆₉₉).

The spelling of 3643685 in words is "three million, six hundred forty-three thousand, six hundred eighty-five".