19990199 has 4 divisors (see below), whose sum is σ = 20074080. Its totient is φ = 19906320.

The previous prime is 19990177. The next prime is 19990213. The reversal of 19990199 is 99109991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99109991 = 167 ⋅593473.

It is a cyclic number.

It is not a de Polignac number, because 19990199 - 2²⁰ = 18941623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19990129) 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, 41582 + ... + 42059.

It is an arithmetic number, because the mean of its divisors is an integer number (5018520).

Almost surely, 2^19990199 is an apocalyptic number.

19990199 is a deficient number, since it is larger than the sum of its proper divisors (83881).

19990199 is an equidigital number, since it uses as much as digits as its factorization.

19990199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83880.

The product of its (nonzero) digits is 59049, while the sum is 47.

The square root of 19990199 is about 4471.0400356069. The cubic root of 19990199 is about 271.3974144028.

The spelling of 19990199 in words is "nineteen million, nine hundred ninety thousand, one hundred ninety-nine".