19993927 has 2 divisors, whose sum is σ = 19993928. Its totient is φ = 19993926.

The previous prime is 19993903. The next prime is 19993943. The reversal of 19993927 is 72939991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19993927 - 2¹¹ = 19991879 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19993997) 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, 9996963 + 9996964.

It is an arithmetic number, because the mean of its divisors is an integer number (9996964).

Almost surely, 2^19993927 is an apocalyptic number.

19993927 is a deficient number, since it is larger than the sum of its proper divisors (1).

19993927 is an equidigital number, since it uses as much as digits as its factorization.

19993927 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 275562, while the sum is 49.

The square root of 19993927 is about 4471.4569214072. The cubic root of 19993927 is about 271.4142844478.

The spelling of 19993927 in words is "nineteen million, nine hundred ninety-three thousand, nine hundred twenty-seven".