8371821 has 8 divisors (see below), whose sum is σ = 11191360. Its totient is φ = 5566752.

The previous prime is 8371819. The next prime is 8371861. The reversal of 8371821 is 1281738.

It is a happy number.

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

It is not a de Polignac number, because 8371821 - 2¹ = 8371819 is a prime.

It is a Duffinian number.

8371821 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8371861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2185 + ... + 4638.

It is an arithmetic number, because the mean of its divisors is an integer number (1398920).

Almost surely, 2^8371821 is an apocalyptic number.

It is an amenable number.

8371821 is a deficient number, since it is larger than the sum of its proper divisors (2819539).

8371821 is a wasteful number, since it uses less digits than its factorization.

8371821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7235.

The product of its digits is 2688, while the sum is 30.

The square root of 8371821 is about 2893.4099260215. The cubic root of 8371821 is about 203.0517069219.

The spelling of 8371821 in words is "eight million, three hundred seventy-one thousand, eight hundred twenty-one".