9997220 has 24 divisors (see below), whose sum is σ = 21074424. Its totient is φ = 3983616.

The previous prime is 9997219. The next prime is 9997237. The reversal of 9997220 is 227999.

It can be written as a sum of positive squares in 4 ways, for example, as 362404 + 9634816 = 602^2 + 3104^2 .

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5462 + ... + 7058.

It is an arithmetic number, because the mean of its divisors is an integer number (878101).

Almost surely, 2^9997220 is an apocalyptic number.

It is an amenable number.

9997220 is an abundant number, since it is smaller than the sum of its proper divisors (11077204).

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

9997220 is a wasteful number, since it uses less digits than its factorization.

9997220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1919 (or 1917 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 9997220 is about 3161.8380730202. The cubic root of 9997220 is about 215.4235027247.

The spelling of 9997220 in words is "nine million, nine hundred ninety-seven thousand, two hundred twenty".