3686399 has 16 divisors (see below), whose sum is σ = 4186080. Its totient is φ = 3225600.

The previous prime is 3686387. The next prime is 3686401. The reversal of 3686399 is 9936863.

It is a Cunningham number, because it is equal to 1920²-1.

It is a cyclic number.

It is not a de Polignac number, because 3686399 - 2⁴ = 3686383 is a prime.

It is an Ulam number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3686329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32567 + ... + 32679.

It is an arithmetic number, because the mean of its divisors is an integer number (261630).

Almost surely, 2^3686399 is an apocalyptic number.

3686399 is a deficient number, since it is larger than the sum of its proper divisors (499681).

3686399 is a wasteful number, since it uses less digits than its factorization.

3686399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250.

The product of its digits is 209952, while the sum is 44.

The square root of 3686399 is about 1919.9997395833. Note that the first 3 decimals coincide. The cubic root of 3686399 is about 154.4782875686.

The spelling of 3686399 in words is "three million, six hundred eighty-six thousand, three hundred ninety-nine".