8221957 has 4 divisors (see below), whose sum is σ = 8237536. Its totient is φ = 8206380.

The previous prime is 8221949. The next prime is 8221963. The reversal of 8221957 is 7591228.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8221957 - 2³ = 8221949 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 (8221937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6969 + ... + 8062.

It is an arithmetic number, because the mean of its divisors is an integer number (2059384).

Almost surely, 2^8221957 is an apocalyptic number.

It is an amenable number.

8221957 is a deficient number, since it is larger than the sum of its proper divisors (15579).

8221957 is a wasteful number, since it uses less digits than its factorization.

8221957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15578.

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

The square root of 8221957 is about 2867.3955081223. The cubic root of 8221957 is about 201.8327946799.

The spelling of 8221957 in words is "eight million, two hundred twenty-one thousand, nine hundred fifty-seven".