3649685 has 8 divisors (see below), whose sum is σ = 4716600. Its totient is φ = 2695104.

The previous prime is 3649669. The next prime is 3649687. The reversal of 3649685 is 5869463.

It can be written as a sum of positive squares in 4 ways, for example, as 271441 + 3378244 = 521^2 + 1838^2 .

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 3649685 - 2⁴ = 3649669 is a prime.

It is a d-powerful number, because it can be written as 3 + 6² + 4⁷ + 9 + 6⁸ + 8³ + 5⁹ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3649687) 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, 28010 + ... + 28139.

It is an arithmetic number, because the mean of its divisors is an integer number (589575).

Almost surely, 2^3649685 is an apocalyptic number.

It is an amenable number.

3649685 is a deficient number, since it is larger than the sum of its proper divisors (1066915).

3649685 is a wasteful number, since it uses less digits than its factorization.

3649685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56167.

The product of its digits is 155520, while the sum is 41.

The square root of 3649685 is about 1910.4148764077. The cubic root of 3649685 is about 153.9637430809.

It can be divided in two parts, 3649 and 685, that added together give a palindrome (4334).

The spelling of 3649685 in words is "three million, six hundred forty-nine thousand, six hundred eighty-five".