8219997 has 12 divisors (see below), whose sum is σ = 11911900. Its totient is φ = 5462208.

The previous prime is 8219983. The next prime is 8220013. The reversal of 8219997 is 7999128.

It can be written as a sum of positive squares in 2 ways, for example, as 7257636 + 962361 = 2694^2 + 981^2 .

It is not a de Polignac number, because 8219997 - 2¹¹ = 8217949 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 (8219917) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1833 + ... + 4449.

Almost surely, 2^8219997 is an apocalyptic number.

It is an amenable number.

8219997 is a deficient number, since it is larger than the sum of its proper divisors (3691903).

8219997 is a wasteful number, since it uses less digits than its factorization.

8219997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2972 (or 2969 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 8219997 is about 2867.0537141812. The cubic root of 8219997 is about 201.8167553632.

It can be divided in two parts, 8219 and 997, that added together give a square (9216 = 96²).

The spelling of 8219997 in words is "eight million, two hundred nineteen thousand, nine hundred ninety-seven".