19918899 has 96 divisors (see below), whose sum is σ = 40517120. Its totient is φ = 9408960.

The previous prime is 19918753. The next prime is 19918901. The reversal of 19918899 is 99881991.

It is not a de Polignac number, because 19918899 - 2¹¹ = 19916851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19913899) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 297264 + ... + 297330.

Almost surely, 2^19918899 is an apocalyptic number.

19918899 is an abundant number, since it is smaller than the sum of its proper divisors (20598221).

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

19918899 is a wasteful number, since it uses less digits than its factorization.

19918899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118 (or 101 counting only the distinct ones).

The product of its digits is 419904, while the sum is 54.

The square root of 19918899 is about 4463.0593767056. The cubic root of 19918899 is about 271.0743612969.

The spelling of 19918899 in words is "nineteen million, nine hundred eighteen thousand, eight hundred ninety-nine".