8173421 has 4 divisors (see below), whose sum is σ = 8186172. Its totient is φ = 8160672.

The previous prime is 8173387. The next prime is 8173423. The reversal of 8173421 is 1243718.

8173421 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.

It can be written as a sum of positive squares in 2 ways, for example, as 4351396 + 3822025 = 2086^2 + 1955^2 .

It is a cyclic number.

It is not a de Polignac number, because 8173421 - 2²² = 3979117 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 (8173423) 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, 5360 + ... + 6713.

It is an arithmetic number, because the mean of its divisors is an integer number (2046543).

Almost surely, 2^8173421 is an apocalyptic number.

It is an amenable number.

8173421 is a deficient number, since it is larger than the sum of its proper divisors (12751).

8173421 is a wasteful number, since it uses less digits than its factorization.

8173421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12750.

The product of its digits is 1344, while the sum is 26.

The square root of 8173421 is about 2858.9195511591. The cubic root of 8173421 is about 201.4348563192.

The spelling of 8173421 in words is "eight million, one hundred seventy-three thousand, four hundred twenty-one".