19992166 has 8 divisors (see below), whose sum is σ = 30061080. Its totient is φ = 9971808.

The previous prime is 19992157. The next prime is 19992169. The reversal of 19992166 is 66129991.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19992169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11091 + ... + 12766.

It is an arithmetic number, because the mean of its divisors is an integer number (3757635).

Almost surely, 2^19992166 is an apocalyptic number.

19992166 is a deficient number, since it is larger than the sum of its proper divisors (10068914).

19992166 is a wasteful number, since it uses less digits than its factorization.

19992166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24278.

The product of its digits is 52488, while the sum is 43.

The square root of 19992166 is about 4471.2600013866. The cubic root of 19992166 is about 271.4063157850.

The spelling of 19992166 in words is "nineteen million, nine hundred ninety-two thousand, one hundred sixty-six".