19992173 has 8 divisors (see below), whose sum is σ = 20633088. Its totient is φ = 19356624.

The previous prime is 19992169. The next prime is 19992191. The reversal of 19992173 is 37129991.

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

It is not a de Polignac number, because 19992173 - 2² = 19992169 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19992173.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19992103) 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, 7040 + ... + 9462.

It is an arithmetic number, because the mean of its divisors is an integer number (2579136).

Almost surely, 2^19992173 is an apocalyptic number.

It is an amenable number.

19992173 is a deficient number, since it is larger than the sum of its proper divisors (640915).

19992173 is a wasteful number, since it uses less digits than its factorization.

19992173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2683.

The product of its digits is 30618, while the sum is 41.

The square root of 19992173 is about 4471.2607841637. The cubic root of 19992173 is about 271.4063474615.

The spelling of 19992173 in words is "nineteen million, nine hundred ninety-two thousand, one hundred seventy-three".