19990027 has 4 divisors (see below), whose sum is σ = 20530336. Its totient is φ = 19449720.

The previous prime is 19989997. The next prime is 19990031. The reversal of 19990027 is 72009991.

19990027 is nontrivially palindromic in base 5.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72009991 = 7949 ⋅9059.

It is a cyclic number.

It is not a de Polignac number, because 19990027 - 2¹⁹ = 19465739 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 540271 = 19990027 / (1 + 9 + 9 + 9 + 0 + 0 + 2 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19990057) 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, 270099 + ... + 270172.

It is an arithmetic number, because the mean of its divisors is an integer number (5132584).

Almost surely, 2^19990027 is an apocalyptic number.

19990027 is a deficient number, since it is larger than the sum of its proper divisors (540309).

19990027 is an equidigital number, since it uses as much as digits as its factorization.

19990027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540308.

The product of its (nonzero) digits is 10206, while the sum is 37.

The square root of 19990027 is about 4471.0208006673. The cubic root of 19990027 is about 271.3966360132.

The spelling of 19990027 in words is "nineteen million, nine hundred ninety thousand, twenty-seven".