2158205 has 24 divisors (see below), whose sum is σ = 3151872. Its totient is φ = 1411872.

The previous prime is 2158183. The next prime is 2158223. The reversal of 2158205 is 5028512.

It is not a de Polignac number, because 2158205 - 2¹² = 2154109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5444 + ... + 5826.

It is an arithmetic number, because the mean of its divisors is an integer number (131328).

2^2158205 is an apocalyptic number.

It is an amenable number.

2158205 is a deficient number, since it is larger than the sum of its proper divisors (993667).

2158205 is a wasteful number, since it uses less digits than its factorization.

2158205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425 (or 418 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 2158205 is about 1469.0830473462. The cubic root of 2158205 is about 129.2302639759.

It can be divided in two parts, 2 and 158205, that multiplied together give a triangular number (316410 = T₇₉₅).

The spelling of 2158205 in words is "two million, one hundred fifty-eight thousand, two hundred five".