2155215 has 16 divisors (see below), whose sum is σ = 3598848. Its totient is φ = 1099296.

The previous prime is 2155207. The next prime is 2155253. The reversal of 2155215 is 5125512.

2155215 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2155215 - 2³ = 2155207 is a prime.

2155215 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2155191 and 2155200.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2779 + ... + 3468.

It is an arithmetic number, because the mean of its divisors is an integer number (224928).

2^2155215 is an apocalyptic number.

2155215 is a deficient number, since it is larger than the sum of its proper divisors (1443633).

2155215 is a wasteful number, since it uses less digits than its factorization.

2155215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6278.

The product of its digits is 500, while the sum is 21.

The square root of 2155215 is about 1468.0650530545. The cubic root of 2155215 is about 129.1705574039.

The spelling of 2155215 in words is "two million, one hundred fifty-five thousand, two hundred fifteen".