3639685 has 8 divisors (see below), whose sum is σ = 4991616. Its totient is φ = 2495760.

The previous prime is 3639667. The next prime is 3639689. The reversal of 3639685 is 5869363.

3639685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 3639685 - 2¹¹ = 3637637 is a prime.

3639685 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3639689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51961 + ... + 52030.

It is an arithmetic number, because the mean of its divisors is an integer number (623952).

Almost surely, 2^3639685 is an apocalyptic number.

3639685 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3639685 is a deficient number, since it is larger than the sum of its proper divisors (1351931).

3639685 is a wasteful number, since it uses less digits than its factorization.

3639685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104003.

The product of its digits is 116640, while the sum is 40.

The square root of 3639685 is about 1907.7958486169. The cubic root of 3639685 is about 153.8229961618.

It can be divided in two parts, 36396 and 85, that added together give a square (36481 = 191²).

The spelling of 3639685 in words is "three million, six hundred thirty-nine thousand, six hundred eighty-five".