2124405 has 24 divisors (see below), whose sum is σ = 3900312. Its totient is φ = 1065984.

The previous prime is 2124403. The next prime is 2124431. The reversal of 2124405 is 5044212.

It can be written as a sum of positive squares in 4 ways, for example, as 161604 + 1962801 = 402^2 + 1401^2 .

It is not a de Polignac number, because 2124405 - 2¹ = 2124403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2124401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 624 + ... + 2153.

It is an arithmetic number, because the mean of its divisors is an integer number (162513).

2^2124405 is an apocalyptic number.

It is an amenable number.

2124405 is a deficient number, since it is larger than the sum of its proper divisors (1775907).

2124405 is a wasteful number, since it uses less digits than its factorization.

2124405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2805 (or 2802 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 2124405 is about 1457.5338761072. The cubic root of 2124405 is about 128.5520790987.

Adding to 2124405 its reverse (5044212), we get a palindrome (7168617).

The spelling of 2124405 in words is "two million, one hundred twenty-four thousand, four hundred five".