19998099 has 12 divisors (see below), whose sum is σ = 31512312. Its totient is φ = 12120000.

The previous prime is 19998047. The next prime is 19998149. The reversal of 19998099 is 99089991.

It is not a de Polignac number, because 19998099 - 2¹² = 19994003 is a prime.

It is a super-2 number, since 2×19998099² = 799847927227602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19998029) 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 11 ways as a sum of consecutive naturals, for example, 100902 + ... + 101099.

It is an arithmetic number, because the mean of its divisors is an integer number (2626026).

Almost surely, 2^19998099 is an apocalyptic number.

19998099 is a deficient number, since it is larger than the sum of its proper divisors (11514213).

19998099 is a wasteful number, since it uses less digits than its factorization.

19998099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202018 (or 202015 counting only the distinct ones).

The product of its (nonzero) digits is 472392, while the sum is 54.

The square root of 19998099 is about 4471.9234116876. The cubic root of 19998099 is about 271.4331612072.

The spelling of 19998099 in words is "nineteen million, nine hundred ninety-eight thousand, ninety-nine".