8221956 has 24 divisors (see below), whose sum is σ = 19270944. Its totient is φ = 2728320.

The previous prime is 8221949. The next prime is 8221963. The reversal of 8221956 is 6591228.

It is an interprime number because it is at equal distance from previous prime (8221949) and next prime (8221963).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1471 + ... + 4313.

It is an arithmetic number, because the mean of its divisors is an integer number (802956).

Almost surely, 2^8221956 is an apocalyptic number.

8221956 is the 1814-th centered pentagonal number.

It is an amenable number.

8221956 is an abundant number, since it is smaller than the sum of its proper divisors (11048988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8221956 is a wasteful number, since it uses less digits than its factorization.

8221956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3091 (or 3089 counting only the distinct ones).

The product of its digits is 8640, while the sum is 33.

The square root of 8221956 is about 2867.3953337480. The cubic root of 8221956 is about 201.8327864972.

The spelling of 8221956 in words is "eight million, two hundred twenty-one thousand, nine hundred fifty-six".