9917220 has 24 divisors (see below), whose sum is σ = 27768384. Its totient is φ = 2644576.

The previous prime is 9917207. The next prime is 9917231. The reversal of 9917220 is 227199.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an Ulam number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82584 + ... + 82703.

It is an arithmetic number, because the mean of its divisors is an integer number (1157016).

Almost surely, 2^9917220 is an apocalyptic number.

It is an amenable number.

9917220 is an abundant number, since it is smaller than the sum of its proper divisors (17851164).

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

9917220 is a wasteful number, since it uses less digits than its factorization.

9917220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165299 (or 165297 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 9917220 is about 3149.1617932396. The cubic root of 9917220 is about 214.8473407025.

The spelling of 9917220 in words is "nine million, nine hundred seventeen thousand, two hundred twenty".