990173 has 4 divisors (see below), whose sum is σ = 1033248. Its totient is φ = 947100.

The previous prime is 990169. The next prime is 990179. The reversal of 990173 is 371099.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 990173 - 2² = 990169 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990179) 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, 21503 + ... + 21548.

It is an arithmetic number, because the mean of its divisors is an integer number (258312).

2⁹⁹⁰¹⁷³ is an apocalyptic number.

It is an amenable number.

990173 is a deficient number, since it is larger than the sum of its proper divisors (43075).

990173 is a wasteful number, since it uses less digits than its factorization.

990173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43074.

The product of its (nonzero) digits is 1701, while the sum is 29.

The square root of 990173 is about 995.0743690800. The cubic root of 990173 is about 99.6713544375.

The spelling of 990173 in words is "nine hundred ninety thousand, one hundred seventy-three".