8257921 has 12 divisors (see below), whose sum is σ = 9689088. Its totient is φ = 7017192.

The previous prime is 8257889. The next prime is 8257957. The reversal of 8257921 is 1297528.

It is not a de Polignac number, because 8257921 - 2⁵ = 8257889 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 (8257321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5560 + ... + 6886.

It is an arithmetic number, because the mean of its divisors is an integer number (807424).

Almost surely, 2^8257921 is an apocalyptic number.

It is an amenable number.

8257921 is a deficient number, since it is larger than the sum of its proper divisors (1431167).

8257921 is a wasteful number, since it uses less digits than its factorization.

8257921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1468 (or 1461 counting only the distinct ones).

The product of its digits is 10080, while the sum is 34.

The square root of 8257921 is about 2873.6598615703. The cubic root of 8257921 is about 202.1266483502.

The spelling of 8257921 in words is "eight million, two hundred fifty-seven thousand, nine hundred twenty-one".