123199986 has 96 divisors (see below), whose sum is σ = 323180928. Its totient is φ = 30551040.

The previous prime is 123199963. The next prime is 123199987. The reversal of 123199986 is 689991321.

It is not an unprimeable number, because it can be changed into a prime (123199987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 120156 + ... + 121176.

It is an arithmetic number, because the mean of its divisors is an integer number (3366468).

Almost surely, 2^123199986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123199986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161590464).

123199986 is an abundant number, since it is smaller than the sum of its proper divisors (199980942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123199986 is a wasteful number, since it uses less digits than its factorization.

123199986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076 (or 1063 counting only the distinct ones).

The product of its digits is 209952, while the sum is 48.

The square root of 123199986 is about 11099.5489097530. The cubic root of 123199986 is about 497.5883680978.

The spelling of 123199986 in words is "one hundred twenty-three million, one hundred ninety-nine thousand, nine hundred eighty-six".