8023921 has 4 divisors (see below), whose sum is σ = 8039844. Its totient is φ = 8008000.

The previous prime is 8023901. The next prime is 8023957. The reversal of 8023921 is 1293208.

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 5880625 + 2143296 = 2425^2 + 1464^2 .

It is a cyclic number.

It is not a de Polignac number, because 8023921 - 2⁵ = 8023889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8023901) 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, 7180 + ... + 8221.

It is an arithmetic number, because the mean of its divisors is an integer number (2009961).

Almost surely, 2^8023921 is an apocalyptic number.

It is an amenable number.

8023921 is a deficient number, since it is larger than the sum of its proper divisors (15923).

8023921 is a wasteful number, since it uses less digits than its factorization.

8023921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15922.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 8023921 is about 2832.6526437246. The cubic root of 8023921 is about 200.1991433106.

The spelling of 8023921 in words is "eight million, twenty-three thousand, nine hundred twenty-one".