2123705 has 16 divisors (see below), whose sum is σ = 2712960. Its totient is φ = 1592448.

The previous prime is 2123701. The next prime is 2123707. The reversal of 2123705 is 5073212.

2123705 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 2123705 - 2² = 2123701 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2123701) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 6629 + ... + 6941.

It is an arithmetic number, because the mean of its divisors is an integer number (169560).

2^2123705 is an apocalyptic number.

It is an amenable number.

2123705 is a deficient number, since it is larger than the sum of its proper divisors (589255).

2123705 is a wasteful number, since it uses less digits than its factorization.

2123705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 2123705 is about 1457.2937246828. The cubic root of 2123705 is about 128.5379580718.

Adding to 2123705 its reverse (5073212), we get a palindrome (7196917).

The spelling of 2123705 in words is "two million, one hundred twenty-three thousand, seven hundred five".