9990173 has 4 divisors (see below), whose sum is σ = 10031868. Its totient is φ = 9948480.

The previous prime is 9990163. The next prime is 9990187. The reversal of 9990173 is 3710999.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3710999 = 653 ⋅5683.

It can be written as a sum of positive squares in 2 ways, for example, as 3829849 + 6160324 = 1957^2 + 2482^2 .

It is a de Polignac number, because none of the positive numbers 2^k-9990173 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9990133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20486 + ... + 20967.

It is an arithmetic number, because the mean of its divisors is an integer number (2507967).

Almost surely, 2^9990173 is an apocalyptic number.

It is an amenable number.

9990173 is a deficient number, since it is larger than the sum of its proper divisors (41695).

9990173 is a wasteful number, since it uses less digits than its factorization.

9990173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41694.

The product of its (nonzero) digits is 15309, while the sum is 38.

The square root of 9990173 is about 3160.7234931262. The cubic root of 9990173 is about 215.3728737745.

The spelling of 9990173 in words is "nine million, nine hundred ninety thousand, one hundred seventy-three".