3685591 has 16 divisors (see below), whose sum is σ = 4592448. Its totient is φ = 2880000.

The previous prime is 3685571. The next prime is 3685597. The reversal of 3685591 is 1955863.

It is a 9-Lehmer number, since φ(3685591) divides (3685591-1)⁹.

It is a cyclic number.

It is not a de Polignac number, because 3685591 - 2⁷ = 3685463 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3685591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3685597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8991 + ... + 9391.

It is an arithmetic number, because the mean of its divisors is an integer number (287028).

Almost surely, 2^3685591 is an apocalyptic number.

3685591 is a deficient number, since it is larger than the sum of its proper divisors (906857).

3685591 is a wasteful number, since it uses less digits than its factorization.

3685591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522.

The product of its digits is 32400, while the sum is 37.

The square root of 3685591 is about 1919.7893113568. The cubic root of 3685591 is about 154.4670003497.

The spelling of 3685591 in words is "three million, six hundred eighty-five thousand, five hundred ninety-one".