9997218 has 48 divisors (see below), whose sum is σ = 27009216. Its totient is φ = 2596320.

The previous prime is 9997201. The next prime is 9997219. The reversal of 9997218 is 8127999.

It is not an unprimeable number, because it can be changed into a prime (9997219) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2221 + ... + 4992.

It is an arithmetic number, because the mean of its divisors is an integer number (562692).

Almost surely, 2^9997218 is an apocalyptic number.

9997218 is an abundant number, since it is smaller than the sum of its proper divisors (17011998).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9997218 is a wasteful number, since it uses less digits than its factorization.

9997218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7239 (or 7236 counting only the distinct ones).

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

The square root of 9997218 is about 3161.8377567484. The cubic root of 9997218 is about 215.4234883592.

The spelling of 9997218 in words is "nine million, nine hundred ninety-seven thousand, two hundred eighteen".