2155218 has 16 divisors (see below), whose sum is σ = 4642176. Its totient is φ = 663120.

The previous prime is 2155207. The next prime is 2155253. The reversal of 2155218 is 8125512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13738 + ... + 13893.

It is an arithmetic number, because the mean of its divisors is an integer number (290136).

2^2155218 is an apocalyptic number.

2155218 is an abundant number, since it is smaller than the sum of its proper divisors (2486958).

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

2155218 is a wasteful number, since it uses less digits than its factorization.

2155218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27649.

The product of its digits is 800, while the sum is 24.

The square root of 2155218 is about 1468.0660748073. The cubic root of 2155218 is about 129.1706173378.

The spelling of 2155218 in words is "two million, one hundred fifty-five thousand, two hundred eighteen".