8264821 has 4 divisors (see below), whose sum is σ = 8466444. Its totient is φ = 8063200.

The previous prime is 8264819. The next prime is 8264831. The reversal of 8264821 is 1284628.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2924100 + 5340721 = 1710^2 + 2311^2 .

It is a cyclic number.

It is not a de Polignac number, because 8264821 - 2¹ = 8264819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8264831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100750 + ... + 100831.

It is an arithmetic number, because the mean of its divisors is an integer number (2116611).

Almost surely, 2^8264821 is an apocalyptic number.

It is an amenable number.

8264821 is a deficient number, since it is larger than the sum of its proper divisors (201623).

8264821 is a wasteful number, since it uses less digits than its factorization.

8264821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201622.

The product of its digits is 6144, while the sum is 31.

The square root of 8264821 is about 2874.8601705126. The cubic root of 8264821 is about 202.1829290860.

The spelling of 8264821 in words is "eight million, two hundred sixty-four thousand, eight hundred twenty-one".