990172 has 12 divisors (see below), whose sum is σ = 1757056. Its totient is φ = 488160.

The previous prime is 990169. The next prime is 990179. The reversal of 990172 is 271099.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 990172.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1404 + ... + 1987.

2⁹⁹⁰¹⁷² is an apocalyptic number.

It is an amenable number.

990172 is a deficient number, since it is larger than the sum of its proper divisors (766884).

990172 is a wasteful number, since it uses less digits than its factorization.

990172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3468 (or 3466 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 28.

The square root of 990172 is about 995.0738666049. The cubic root of 990172 is about 99.6713208840.

The spelling of 990172 in words is "nine hundred ninety thousand, one hundred seventy-two".