8272821 has 4 divisors (see below), whose sum is σ = 11030432. Its totient is φ = 5515212.

The previous prime is 8272819. The next prime is 8272853. The reversal of 8272821 is 1282728.

It is a happy number.

8272821 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 8272821 - 2¹ = 8272819 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 (8272861) 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, 1378801 + ... + 1378806.

It is an arithmetic number, because the mean of its divisors is an integer number (2757608).

Almost surely, 2^8272821 is an apocalyptic number.

It is an amenable number.

8272821 is a deficient number, since it is larger than the sum of its proper divisors (2757611).

8272821 is a wasteful number, since it uses less digits than its factorization.

8272821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2757610.

The product of its digits is 3584, while the sum is 30.

The square root of 8272821 is about 2876.2512059971. The cubic root of 8272821 is about 202.2481429135.

The spelling of 8272821 in words is "eight million, two hundred seventy-two thousand, eight hundred twenty-one".