2005123 has 4 divisors (see below), whose sum is σ = 2009008. Its totient is φ = 2001240.

The previous prime is 2005121. The next prime is 2005139. The reversal of 2005123 is 3215002.

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 2005123 - 2¹ = 2005121 is a prime.

It is a Duffinian number.

2005123 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2005121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1023 + ... + 2248.

It is an arithmetic number, because the mean of its divisors is an integer number (502252).

2^2005123 is an apocalyptic number.

2005123 is a deficient number, since it is larger than the sum of its proper divisors (3885).

2005123 is an equidigital number, since it uses as much as digits as its factorization.

2005123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3884.

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 2005123 is about 1416.0236579945. The cubic root of 2005123 is about 126.0995895268.

The spelling of 2005123 in words is "two million, five thousand, one hundred twenty-three".