3865212 has 48 divisors (see below), whose sum is σ = 10795680. Its totient is φ = 1188864.

The previous prime is 3865187. The next prime is 3865229. The reversal of 3865212 is 2125683.

3865212 is a `hidden beast` number, since 3 + 8 + 652 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nialpdrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28 + ... + 2780.

It is an arithmetic number, because the mean of its divisors is an integer number (224910).

Almost surely, 2^3865212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3865212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5397840).

3865212 is an abundant number, since it is smaller than the sum of its proper divisors (6930468).

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

3865212 is a wasteful number, since it uses less digits than its factorization.

3865212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2779 (or 2771 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 3865212 is about 1966.0142420644. The cubic root of 3865212 is about 156.9366723648.

The spelling of 3865212 in words is "three million, eight hundred sixty-five thousand, two hundred twelve".