8221915 has 8 divisors (see below), whose sum is σ = 10625328. Its totient is φ = 6071520.

The previous prime is 8221903. The next prime is 8221919. The reversal of 8221915 is 5191228.

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

It is not a de Polignac number, because 8221915 - 2⁹ = 8221403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8221919) 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, 63181 + ... + 63310.

It is an arithmetic number, because the mean of its divisors is an integer number (1328166).

Almost surely, 2^8221915 is an apocalyptic number.

8221915 is a deficient number, since it is larger than the sum of its proper divisors (2403413).

8221915 is a wasteful number, since it uses less digits than its factorization.

8221915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126509.

The product of its digits is 1440, while the sum is 28.

The square root of 8221915 is about 2867.3881843936. The cubic root of 8221915 is about 201.8324510070.

The spelling of 8221915 in words is "eight million, two hundred twenty-one thousand, nine hundred fifteen".