19900899 has 6 divisors (see below), whose sum is σ = 28745756. Its totient is φ = 13267260.

The previous prime is 19900891. The next prime is 19900901. The reversal of 19900899 is 99800991.

It is not a de Polignac number, because 19900899 - 2³ = 19900891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19900891) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1105597 + ... + 1105614.

Almost surely, 2^19900899 is an apocalyptic number.

19900899 is a deficient number, since it is larger than the sum of its proper divisors (8844857).

19900899 is a wasteful number, since it uses less digits than its factorization.

19900899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2211217 (or 2211214 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The square root of 19900899 is about 4461.0423669811. The cubic root of 19900899 is about 270.9926832717.

The spelling of 19900899 in words is "nineteen million, nine hundred thousand, eight hundred ninety-nine".