199948123 has 2 divisors, whose sum is σ = 199948124. Its totient is φ = 199948122.

The previous prime is 199948121. The next prime is 199948129. The reversal of 199948123 is 321849991.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199948123 - 2¹ = 199948121 is a prime.

Together with 199948121, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (199948121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99974061 + 99974062.

It is an arithmetic number, because the mean of its divisors is an integer number (99974062).

Almost surely, 2^199948123 is an apocalyptic number.

199948123 is a deficient number, since it is larger than the sum of its proper divisors (1).

199948123 is an equidigital number, since it uses as much as digits as its factorization.

199948123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 46.

The square root of 199948123 is about 14140.3013758548. The cubic root of 199948123 is about 584.7529801808.

The spelling of 199948123 in words is "one hundred ninety-nine million, nine hundred forty-eight thousand, one hundred twenty-three".