2123785 has 4 divisors (see below), whose sum is σ = 2548548. Its totient is φ = 1699024.

The previous prime is 2123783. The next prime is 2123791. The reversal of 2123785 is 5873212.

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 1247689 + 876096 = 1117^2 + 936^2 .

It is a cyclic number.

It is not a de Polignac number, because 2123785 - 2¹ = 2123783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2123783) 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, 212374 + ... + 212383.

It is an arithmetic number, because the mean of its divisors is an integer number (637137).

2^2123785 is an apocalyptic number.

It is an amenable number.

2123785 is a deficient number, since it is larger than the sum of its proper divisors (424763).

2123785 is an equidigital number, since it uses as much as digits as its factorization.

2123785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424762.

The product of its digits is 3360, while the sum is 28.

The square root of 2123785 is about 1457.3211725629. The cubic root of 2123785 is about 128.5395720604.

Adding to 2123785 its reverse (5873212), we get a palindrome (7996997).

The spelling of 2123785 in words is "two million, one hundred twenty-three thousand, seven hundred eighty-five".