8220491 has 8 divisors (see below), whose sum is σ = 8364000. Its totient is φ = 8078400.

The previous prime is 8220481. The next prime is 8220493. The reversal of 8220491 is 1940228.

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-8220491 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8220491.

It is not an unprimeable number, because it can be changed into a prime (8220493) 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, 19895 + ... + 20303.

It is an arithmetic number, because the mean of its divisors is an integer number (1045500).

Almost surely, 2^8220491 is an apocalyptic number.

8220491 is a deficient number, since it is larger than the sum of its proper divisors (143509).

8220491 is a wasteful number, since it uses less digits than its factorization.

8220491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 8220491 is about 2867.1398640457. The cubic root of 8220491 is about 201.8207981660.

The spelling of 8220491 in words is "eight million, two hundred twenty thousand, four hundred ninety-one".