19999027 has 2 divisors, whose sum is σ = 19999028. Its totient is φ = 19999026.

The previous prime is 19999019. The next prime is 19999069. The reversal of 19999027 is 72099991.

It is a weak prime.

It is an emirp because it is prime and its reverse (72099991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19999027 - 2³ = 19999019 is a prime.

It is a super-2 number, since 2×19999027² = 799922161893458, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19999127) 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 as a sum of consecutive naturals, namely, 9999513 + 9999514.

It is an arithmetic number, because the mean of its divisors is an integer number (9999514).

Almost surely, 2^19999027 is an apocalyptic number.

19999027 is a deficient number, since it is larger than the sum of its proper divisors (1).

19999027 is an equidigital number, since it uses as much as digits as its factorization.

19999027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 91854, while the sum is 46.

The square root of 19999027 is about 4472.0271689693. The cubic root of 19999027 is about 271.4373597075.

It can be divided in two parts, 1999 and 9027, that added together give a triangular number (11026 = T₁₄₈).

The spelling of 19999027 in words is "nineteen million, nine hundred ninety-nine thousand, twenty-seven".