5557821 has 16 divisors (see below), whose sum is σ = 7728960. Its totient is φ = 3548160.

The previous prime is 5557819. The next prime is 5557843. The reversal of 5557821 is 1287555.

It is a happy number.

It is not a de Polignac number, because 5557821 - 2¹ = 5557819 is a prime.

It is a super-3 number, since 3×5557821³ (a number of 21 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5550821) 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, 16626 + ... + 16956.

It is an arithmetic number, because the mean of its divisors is an integer number (483060).

Almost surely, 2^5557821 is an apocalyptic number.

It is an amenable number.

5557821 is a deficient number, since it is larger than the sum of its proper divisors (2171139).

5557821 is a wasteful number, since it uses less digits than its factorization.

5557821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556.

The product of its digits is 14000, while the sum is 33.

The square root of 5557821 is about 2357.5031283118. The cubic root of 5557821 is about 177.1338321984.

The spelling of 5557821 in words is "five million, five hundred fifty-seven thousand, eight hundred twenty-one".