3861216 has 96 divisors (see below), whose sum is σ = 11642400. Its totient is φ = 1244160.

The previous prime is 3861211. The next prime is 3861223. The reversal of 3861216 is 6121683.

3861216 is a `hidden beast` number, since 38 + 612 + 16 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

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

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

It is a zygodrome in base 7.

It is a self number, because there is not a number n which added to its sum of digits gives 3861216.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3861211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35370 + ... + 35478.

It is an arithmetic number, because the mean of its divisors is an integer number (121275).

Almost surely, 2^3861216 is an apocalyptic number.

3861216 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 3861216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5821200).

3861216 is an abundant number, since it is smaller than the sum of its proper divisors (7781184).

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

3861216 is a wasteful number, since it uses less digits than its factorization.

3861216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 155 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 3861216 is about 1964.9977099223. The cubic root of 3861216 is about 156.8825713927.

Adding to 3861216 its reverse (6121683), we get a palindrome (9982899).

The spelling of 3861216 in words is "three million, eight hundred sixty-one thousand, two hundred sixteen".