2105623 has 4 divisors (see below), whose sum is σ = 2267608. Its totient is φ = 1943640.

The previous prime is 2105611. The next prime is 2105641. The reversal of 2105623 is 3265012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2105623 - 2⁵ = 2105591 is a prime.

It is a Duffinian number.

2105623 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2105623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2105693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80973 + ... + 80998.

It is an arithmetic number, because the mean of its divisors is an integer number (566902).

2^2105623 is an apocalyptic number.

2105623 is a deficient number, since it is larger than the sum of its proper divisors (161985).

2105623 is a wasteful number, since it uses less digits than its factorization.

2105623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161984.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 2105623 is about 1451.0764969498. The cubic root of 2105623 is about 128.1721114080.

It can be divided in two parts, 2 and 105623, that added together give a square (105625 = 325²).

The spelling of 2105623 in words is "two million, one hundred five thousand, six hundred twenty-three".