8167821 has 16 divisors (see below), whose sum is σ = 11343360. Its totient is φ = 5221440.

The previous prime is 8167811. The next prime is 8167823. The reversal of 8167821 is 1287618.

It is a happy number.

8167821 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8167821 - 2¹⁰ = 8166797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8167823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19191 + ... + 19611.

It is an arithmetic number, because the mean of its divisors is an integer number (708960).

Almost surely, 2^8167821 is an apocalyptic number.

It is an amenable number.

8167821 is a deficient number, since it is larger than the sum of its proper divisors (3175539).

8167821 is a wasteful number, since it uses less digits than its factorization.

8167821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676.

The product of its digits is 5376, while the sum is 33.

The square root of 8167821 is about 2857.9399923721. The cubic root of 8167821 is about 201.3888416041.

The spelling of 8167821 in words is "eight million, one hundred sixty-seven thousand, eight hundred twenty-one".