8284921 has 4 divisors (see below), whose sum is σ = 8378100. Its totient is φ = 8191744.

The previous prime is 8284891. The next prime is 8284937. The reversal of 8284921 is 1294828.

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 5760000 + 2524921 = 2400^2 + 1589^2 .

It is a cyclic number.

It is not a de Polignac number, because 8284921 - 2⁵ = 8284889 is a prime.

It is a Duffinian number.

8284921 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (8284951) 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, 46456 + ... + 46633.

It is an arithmetic number, because the mean of its divisors is an integer number (2094525).

Almost surely, 2^8284921 is an apocalyptic number.

It is an amenable number.

8284921 is a deficient number, since it is larger than the sum of its proper divisors (93179).

8284921 is an equidigital number, since it uses as much as digits as its factorization.

8284921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93178.

The product of its digits is 9216, while the sum is 34.

The square root of 8284921 is about 2878.3538698360. The cubic root of 8284921 is about 202.3466989920.

The spelling of 8284921 in words is "eight million, two hundred eighty-four thousand, nine hundred twenty-one".