8193921 has 16 divisors (see below), whose sum is σ = 11899200. Its totient is φ = 4995648.

The previous prime is 8193907. The next prime is 8193929. The reversal of 8193921 is 1293918.

It is not a de Polignac number, because 8193921 - 2⁷ = 8193793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8193929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 826 + ... + 4131.

It is an arithmetic number, because the mean of its divisors is an integer number (743700).

Almost surely, 2^8193921 is an apocalyptic number.

8193921 is the 1653-rd octagonal number.

It is an amenable number.

8193921 is a deficient number, since it is larger than the sum of its proper divisors (3705279).

8193921 is a wasteful number, since it uses less digits than its factorization.

8193921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5008.

The product of its digits is 3888, while the sum is 33.

The square root of 8193921 is about 2862.5025764181. The cubic root of 8193921 is about 201.6031239674.

The spelling of 8193921 in words is "eight million, one hundred ninety-three thousand, nine hundred twenty-one".