2155216 has 30 divisors (see below), whose sum is σ = 4859250. Its totient is φ = 923328.

The previous prime is 2155207. The next prime is 2155253. The reversal of 2155216 is 6125512.

It can be written as a sum of positive squares in only one way, i.e., 1449616 + 705600 = 1204^2 + 840^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 591 + ... + 2158.

It is an arithmetic number, because the mean of its divisors is an integer number (161975).

2^2155216 is an apocalyptic number.

It is an amenable number.

2155216 is an abundant number, since it is smaller than the sum of its proper divisors (2704034).

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

2155216 is a wasteful number, since it uses less digits than its factorization.

2155216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2771 (or 2758 counting only the distinct ones).

The product of its digits is 600, while the sum is 22.

The square root of 2155216 is about 1468.0653936389. The cubic root of 2155216 is about 129.1705773819.

The spelling of 2155216 in words is "two million, one hundred fifty-five thousand, two hundred sixteen".