19899902 has 12 divisors (see below), whose sum is σ = 32810568. Its totient is φ = 9045300.

The previous prime is 19899889. The next prime is 19899947. The reversal of 19899902 is 20999891.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40874 + ... + 41357.

It is an arithmetic number, because the mean of its divisors is an integer number (2734214).

Almost surely, 2^19899902 is an apocalyptic number.

19899902 is a deficient number, since it is larger than the sum of its proper divisors (12910666).

19899902 is a wasteful number, since it uses less digits than its factorization.

19899902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82255 (or 82244 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 47.

The square root of 19899902 is about 4460.9306203975. The cubic root of 19899902 is about 270.9881577774.

The spelling of 19899902 in words is "nineteen million, eight hundred ninety-nine thousand, nine hundred two".