3105216 has 70 divisors (see below), whose sum is σ = 9220200. Its totient is φ = 1033344.

The previous prime is 3105211. The next prime is 3105251. The reversal of 3105216 is 6125013.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3105211) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4885 + ... + 5483.

Almost surely, 2^3105216 is an apocalyptic number.

3105216 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 3105216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4610100).

3105216 is an abundant number, since it is smaller than the sum of its proper divisors (6114984).

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

3105216 is an equidigital number, since it uses as much as digits as its factorization.

3105216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623 (or 604 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 3105216 is about 1762.1623080749. The cubic root of 3105216 is about 145.8917067720.

It can be divided in two parts, 3105 and 216, that added together give a triangular number (3321 = T₈₁).

The spelling of 3105216 in words is "three million, one hundred five thousand, two hundred sixteen".