199389023 has 2 divisors, whose sum is σ = 199389024. Its totient is φ = 199389022.

The previous prime is 199389011. The next prime is 199389067. The reversal of 199389023 is 320983991.

It is an a-pointer prime, because the next prime (199389067) can be obtained adding 199389023 to its sum of digits (44).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199389023 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199389823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99694511 + 99694512.

It is an arithmetic number, because the mean of its divisors is an integer number (99694512).

Almost surely, 2^199389023 is an apocalyptic number.

199389023 is a deficient number, since it is larger than the sum of its proper divisors (1).

199389023 is an equidigital number, since it uses as much as digits as its factorization.

199389023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 199389023 is about 14120.5178021204. The cubic root of 199389023 is about 584.2074376855.

The spelling of 199389023 in words is "one hundred ninety-nine million, three hundred eighty-nine thousand, twenty-three".