123688889 has 8 divisors (see below), whose sum is σ = 132238080. Its totient is φ = 115281216.

The previous prime is 123688883. The next prime is 123688919. The reversal of 123688889 is 988886321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 123688889 - 2²⁰ = 122640313 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 123688889.

It is not an unprimeable number, because it can be changed into a prime (123688883) 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 in 7 ways as a sum of consecutive naturals, for example, 33569 + ... + 37070.

It is an arithmetic number, because the mean of its divisors is an integer number (16529760).

Almost surely, 2^123688889 is an apocalyptic number.

It is an amenable number.

123688889 is a deficient number, since it is larger than the sum of its proper divisors (8549191).

123688889 is a wasteful number, since it uses less digits than its factorization.

123688889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70759.

The product of its digits is 1327104, while the sum is 53.

The square root of 123688889 is about 11121.5506562709. The cubic root of 123688889 is about 498.2457040903.

The spelling of 123688889 in words is "one hundred twenty-three million, six hundred eighty-eight thousand, eight hundred eighty-nine".