2123615 has 16 divisors (see below), whose sum is σ = 2821728. Its totient is φ = 1524096.

The previous prime is 2123603. The next prime is 2123617. The reversal of 2123615 is 5163212.

It is a cyclic number.

It is not a de Polignac number, because 2123615 - 2¹⁸ = 1861471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123617) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1964 + ... + 2846.

It is an arithmetic number, because the mean of its divisors is an integer number (176358).

2^2123615 is an apocalyptic number.

2123615 is a deficient number, since it is larger than the sum of its proper divisors (698113).

2123615 is a wasteful number, since it uses less digits than its factorization.

2123615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938.

The product of its digits is 360, while the sum is 20.

The square root of 2123615 is about 1457.2628451999. The cubic root of 2123615 is about 128.5361422860.

Adding to 2123615 its reverse (5163212), we get a palindrome (7286827).

The spelling of 2123615 in words is "two million, one hundred twenty-three thousand, six hundred fifteen".