8942221 has 8 divisors (see below), whose sum is σ = 9513720. Its totient is φ = 8375808.

The previous prime is 8942207. The next prime is 8942233. The reversal of 8942221 is 1222498.

8942221 = 2114² + 2115².

It can be written as a sum of positive squares in 4 ways, for example, as 4473225 + 4468996 = 2115^2 + 2114^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8942221 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 8942221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8942261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2745 + ... + 5041.

It is an arithmetic number, because the mean of its divisors is an integer number (1189215).

Almost surely, 2^8942221 is an apocalyptic number.

8942221 is the 2115-th centered square number.

It is an amenable number.

8942221 is a deficient number, since it is larger than the sum of its proper divisors (571499).

8942221 is a wasteful number, since it uses less digits than its factorization.

8942221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2543.

The product of its digits is 2304, while the sum is 28.

The square root of 8942221 is about 2990.3546612400. The cubic root of 8942221 is about 207.5622960968.

The spelling of 8942221 in words is "eight million, nine hundred forty-two thousand, two hundred twenty-one".