199927999 has 2 divisors, whose sum is σ = 199928000. Its totient is φ = 199927998.

The previous prime is 199927997. The next prime is 199928017. The reversal of 199927999 is 999729991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199927999 - 2¹ = 199927997 is a prime.

Together with 199927997, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 199927999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199927997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99963999 + 99964000.

It is an arithmetic number, because the mean of its divisors is an integer number (99964000).

Almost surely, 2^199927999 is an apocalyptic number.

199927999 is a deficient number, since it is larger than the sum of its proper divisors (1).

199927999 is an equidigital number, since it uses as much as digits as its factorization.

199927999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7440174, while the sum is 64.

The square root of 199927999 is about 14139.5897748131. The cubic root of 199927999 is about 584.7333618191.

The spelling of 199927999 in words is "one hundred ninety-nine million, nine hundred twenty-seven thousand, nine hundred ninety-nine".