2138105 has 4 divisors (see below), whose sum is σ = 2565732. Its totient is φ = 1710480.

The previous prime is 2138093. The next prime is 2138137. The reversal of 2138105 is 5018312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1006009 + 1132096 = 1003^2 + 1064^2 .

It is not a de Polignac number, because 2138105 - 2¹⁶ = 2072569 is a prime.

It is a Duffinian number.

It is a Curzon 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 3 ways as a sum of consecutive naturals, for example, 213806 + ... + 213815.

It is an arithmetic number, because the mean of its divisors is an integer number (641433).

2^2138105 is an apocalyptic number.

It is an amenable number.

2138105 is a deficient number, since it is larger than the sum of its proper divisors (427627).

2138105 is an equidigital number, since it uses as much as digits as its factorization.

2138105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427626.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 2138105 is about 1462.2260427171. The cubic root of 2138105 is about 128.8278255084.

The spelling of 2138105 in words is "two million, one hundred thirty-eight thousand, one hundred five".