19992008 has 16 divisors (see below), whose sum is σ = 37543500. Its totient is φ = 9980416.

The previous prime is 19992001. The next prime is 19992029. The reversal of 19992008 is 80029991.

It can be written as a sum of positive squares in 2 ways, for example, as 15984004 + 4008004 = 3998^2 + 2002^2 .

It is not an unprimeable number, because it can be changed into a prime (19992001) 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, 4928 + ... + 8016.

Almost surely, 2^19992008 is an apocalyptic number.

It is an amenable number.

19992008 is a deficient number, since it is larger than the sum of its proper divisors (17551492).

19992008 is a wasteful number, since it uses less digits than its factorization.

19992008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3904 (or 3900 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 19992008 is about 4471.2423329540. The cubic root of 19992008 is about 271.4056007998.

The spelling of 19992008 in words is "nineteen million, nine hundred ninety-two thousand, eight".