2158245 has 30 divisors (see below), whose sum is σ = 3922578. Its totient is φ = 1135296.

The previous prime is 2158237. The next prime is 2158259. The reversal of 2158245 is 5428512.

It is a happy number.

2158245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 311364 + 1846881 = 558^2 + 1359^2 .

It is not a de Polignac number, because 2158245 - 2³ = 2158237 is a prime.

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

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 29 ways as a sum of consecutive naturals, for example, 29529 + ... + 29601.

2^2158245 is an apocalyptic number.

It is an amenable number.

2158245 is a deficient number, since it is larger than the sum of its proper divisors (1764333).

2158245 is an frugal number, since it uses more digits than its factorization.

2158245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163 (or 81 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 2158245 is about 1469.0966612174. The cubic root of 2158245 is about 129.2310623522.

The spelling of 2158245 in words is "two million, one hundred fifty-eight thousand, two hundred forty-five".