8220999 has 4 divisors (see below), whose sum is σ = 10961336. Its totient is φ = 5480664.

The previous prime is 8220937. The next prime is 8221009. The reversal of 8220999 is 9990228.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 8220999 - 2⁸ = 8220743 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 (8220929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1370164 + ... + 1370169.

It is an arithmetic number, because the mean of its divisors is an integer number (2740334).

Almost surely, 2^8220999 is an apocalyptic number.

8220999 is a deficient number, since it is larger than the sum of its proper divisors (2740337).

8220999 is a wasteful number, since it uses less digits than its factorization.

8220999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2740336.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 8220999 is about 2867.2284527048. The cubic root of 8220999 is about 201.8249553732.

The spelling of 8220999 in words is "eight million, two hundred twenty thousand, nine hundred ninety-nine".