5605821 has 16 divisors (see below), whose sum is σ = 8944320. Its totient is φ = 3449520.

The previous prime is 5605811. The next prime is 5605829. The reversal of 5605821 is 1285065.

It is not a de Polignac number, because 5605821 - 2¹⁵ = 5573053 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5605829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7635 + ... + 8336.

It is an arithmetic number, because the mean of its divisors is an integer number (559020).

Almost surely, 2^5605821 is an apocalyptic number.

It is an amenable number.

5605821 is a deficient number, since it is larger than the sum of its proper divisors (3338499).

5605821 is a wasteful number, since it uses less digits than its factorization.

5605821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15993 (or 15987 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 5605821 is about 2367.6615045230. The cubic root of 5605821 is about 177.6423086748.

The spelling of 5605821 in words is "five million, six hundred five thousand, eight hundred twenty-one".