3865806 has 60 divisors (see below), whose sum is σ = 10097208. Its totient is φ = 1102248.

The previous prime is 3865801. The next prime is 3865819. The reversal of 3865806 is 6085683.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3865801) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 7695 + ... + 8181.

Almost surely, 2^3865806 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3865806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5048604).

3865806 is an abundant number, since it is smaller than the sum of its proper divisors (6231402).

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

3865806 is a wasteful number, since it uses less digits than its factorization.

3865806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515 (or 499 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 3865806 is about 1966.1653033252. The cubic root of 3865806 is about 156.9447112174.

The spelling of 3865806 in words is "three million, eight hundred sixty-five thousand, eight hundred six".