3639636 has 144 divisors (see below), whose sum is σ = 12475008. Its totient is φ = 864000.

The previous prime is 3639631. The next prime is 3639637. The reversal of 3639636 is 6369363.

3639636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 3639636.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3639631) 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 47 ways as a sum of consecutive naturals, for example, 35986 + ... + 36086.

It is an arithmetic number, because the mean of its divisors is an integer number (86632).

Almost surely, 2^3639636 is an apocalyptic number.

3639636 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3639636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6237504).

3639636 is an abundant number, since it is smaller than the sum of its proper divisors (8835372).

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

3639636 is a wasteful number, since it uses less digits than its factorization.

3639636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 137 counting only the distinct ones).

The product of its digits is 52488, while the sum is 36.

The square root of 3639636 is about 1907.7830065288. The cubic root of 3639636 is about 153.8223058676.

3639636 divided by its sum of digits (36) gives a palindrome (101101).

It can be divided in two parts, 363 and 9636, that added together give a palindrome (9999).

The spelling of 3639636 in words is "three million, six hundred thirty-nine thousand, six hundred thirty-six".