19899168 has 48 divisors (see below), whose sum is σ = 53234496. Its totient is φ = 6506240.

The previous prime is 19899127. The next prime is 19899169. The reversal of 19899168 is 86199891.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 19899168.

It is not an unprimeable number, because it can be changed into a prime (19899169) 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 7 ways as a sum of consecutive naturals, for example, 3133 + ... + 7043.

It is an arithmetic number, because the mean of its divisors is an integer number (1109052).

Almost surely, 2^19899168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19899168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26617248).

19899168 is an abundant number, since it is smaller than the sum of its proper divisors (33335328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19899168 is a wasteful number, since it uses less digits than its factorization.

19899168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3977 (or 3969 counting only the distinct ones).

The product of its digits is 279936, while the sum is 51.

The square root of 19899168 is about 4460.8483498097. The cubic root of 19899168 is about 270.9848259728.

The spelling of 19899168 in words is "nineteen million, eight hundred ninety-nine thousand, one hundred sixty-eight".