123868189 has 2 divisors, whose sum is σ = 123868190. Its totient is φ = 123868188.

The previous prime is 123868187. The next prime is 123868207. The reversal of 123868189 is 981868321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95160025 + 28708164 = 9755^2 + 5358^2 .

It is a cyclic number.

It is not a de Polignac number, because 123868189 - 2¹ = 123868187 is a prime.

It is a super-2 number, since 2×123868189² = 30686656492279442, which contains 22 as substring.

Together with 123868187, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123868187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61934094 + 61934095.

It is an arithmetic number, because the mean of its divisors is an integer number (61934095).

Almost surely, 2^123868189 is an apocalyptic number.

It is an amenable number.

123868189 is a deficient number, since it is larger than the sum of its proper divisors (1).

123868189 is an equidigital number, since it uses as much as digits as its factorization.

123868189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 46.

The square root of 123868189 is about 11129.6086633808. The cubic root of 123868189 is about 498.4863409634.

The spelling of 123868189 in words is "one hundred twenty-three million, eight hundred sixty-eight thousand, one hundred eighty-nine".