200000123 has 2 divisors, whose sum is σ = 200000124. Its totient is φ = 200000122.

The previous prime is 200000117. The next prime is 200000131. The reversal of 200000123 is 321000002.

It is an a-pointer prime, because the next prime (200000131) can be obtained adding 200000123 to its sum of digits (8).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 200000123 - 2⁴ = 200000107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 200000123.

It is not a weakly prime, because it can be changed into another prime (200000183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100000061 + 100000062.

It is an arithmetic number, because the mean of its divisors is an integer number (100000062).

Almost surely, 2^200000123 is an apocalyptic number.

200000123 is a deficient number, since it is larger than the sum of its proper divisors (1).

200000123 is an equidigital number, since it uses as much as digits as its factorization.

200000123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 200000123 is about 14142.1399724370. The cubic root of 200000123 is about 584.8036675273.

Adding to 200000123 its reverse (321000002), we get a palindrome (521000125).

The spelling of 200000123 in words is "two hundred million, one hundred twenty-three", and thus it is an aban number.