9990217 has 8 divisors (see below), whose sum is σ = 10150560. Its totient is φ = 9831360.

The previous prime is 9990209. The next prime is 9990221. The reversal of 9990217 is 7120999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9990217 - 2³ = 9990209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9990017) 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, 23634 + ... + 24052.

It is an arithmetic number, because the mean of its divisors is an integer number (1268820).

Almost surely, 2^9990217 is an apocalyptic number.

It is an amenable number.

9990217 is a deficient number, since it is larger than the sum of its proper divisors (160343).

9990217 is a wasteful number, since it uses less digits than its factorization.

9990217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743.

The product of its (nonzero) digits is 10206, while the sum is 37.

The square root of 9990217 is about 3160.7304535503. The cubic root of 9990217 is about 215.3731899650.

The spelling of 9990217 in words is "nine million, nine hundred ninety thousand, two hundred seventeen".