2421605 has 8 divisors (see below), whose sum is σ = 2936472. Its totient is φ = 1916928.

The previous prime is 2421593. The next prime is 2421641. The reversal of 2421605 is 5061242.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 114244 + 2307361 = 338^2 + 1519^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2421605 - 2⁴ = 2421589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2012 + ... + 2981.

It is an arithmetic number, because the mean of its divisors is an integer number (367059).

2^2421605 is an apocalyptic number.

It is an amenable number.

2421605 is a deficient number, since it is larger than the sum of its proper divisors (514867).

2421605 is an equidigital number, since it uses as much as digits as its factorization.

2421605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5095.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 2421605 is about 1556.1506996432. The cubic root of 2421605 is about 134.2871432192.

Adding to 2421605 its reverse (5061242), we get a palindrome (7482847).

The spelling of 2421605 in words is "two million, four hundred twenty-one thousand, six hundred five".