5187821 has 4 divisors (see below), whose sum is σ = 5308512. Its totient is φ = 5067132.

The previous prime is 5187803. The next prime is 5187827. The reversal of 5187821 is 1287815.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 5187821 - 2¹⁴ = 5171437 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5187827) 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 3 ways as a sum of consecutive naturals, for example, 60281 + ... + 60366.

It is an arithmetic number, because the mean of its divisors is an integer number (1327128).

Almost surely, 2^5187821 is an apocalyptic number.

It is an amenable number.

5187821 is a deficient number, since it is larger than the sum of its proper divisors (120691).

5187821 is a wasteful number, since it uses less digits than its factorization.

5187821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120690.

The product of its digits is 4480, while the sum is 32.

The square root of 5187821 is about 2277.6788623509. The cubic root of 5187821 is about 173.1124598736.

The spelling of 5187821 in words is "five million, one hundred eighty-seven thousand, eight hundred twenty-one".