2123605 has 8 divisors (see below), whose sum is σ = 2780064. Its totient is φ = 1544400.

The previous prime is 2123603. The next prime is 2123617. The reversal of 2123605 is 5063212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2123605 - 2¹ = 2123603 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19251 + ... + 19360.

It is an arithmetic number, because the mean of its divisors is an integer number (347508).

2^2123605 is an apocalyptic number.

It is an amenable number.

2123605 is a deficient number, since it is larger than the sum of its proper divisors (656459).

2123605 is a wasteful number, since it uses less digits than its factorization.

2123605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38627.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 2123605 is about 1457.2594141058. The cubic root of 2123605 is about 128.5359405289.

Adding to 2123605 its reverse (5063212), we get a palindrome (7186817).

The spelling of 2123605 in words is "two million, one hundred twenty-three thousand, six hundred five".