3685638 has 16 divisors (see below), whose sum is σ = 8041536. Its totient is φ = 1116840.

The previous prime is 3685631. The next prime is 3685657. The reversal of 3685638 is 8365863.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3685596 and 3685605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3685631) 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, 27856 + ... + 27987.

It is an arithmetic number, because the mean of its divisors is an integer number (502596).

Almost surely, 2^3685638 is an apocalyptic number.

3685638 is an abundant number, since it is smaller than the sum of its proper divisors (4355898).

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

3685638 is a wasteful number, since it uses less digits than its factorization.

3685638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55859.

The product of its digits is 103680, while the sum is 39.

The square root of 3685638 is about 1919.8015522444. The cubic root of 3685638 is about 154.4676569534.

It can be divided in two parts, 368 and 5638, that added together give a palindrome (6006).

The spelling of 3685638 in words is "three million, six hundred eighty-five thousand, six hundred thirty-eight".