8028421 has 4 divisors (see below), whose sum is σ = 8048844. Its totient is φ = 8008000.

The previous prime is 8028413. The next prime is 8028439. The reversal of 8028421 is 1248208.

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 4456321 + 3572100 = 2111^2 + 1890^2 .

It is a cyclic number.

It is not a de Polignac number, because 8028421 - 2³ = 8028413 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 (8028491) 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, 9610 + ... + 10411.

It is an arithmetic number, because the mean of its divisors is an integer number (2012211).

Almost surely, 2^8028421 is an apocalyptic number.

It is an amenable number.

8028421 is a deficient number, since it is larger than the sum of its proper divisors (20423).

8028421 is a wasteful number, since it uses less digits than its factorization.

8028421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20422.

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 8028421 is about 2833.4468408636. The cubic root of 8028421 is about 200.2365617490.

The spelling of 8028421 in words is "eight million, twenty-eight thousand, four hundred twenty-one".