123566889 has 8 divisors (see below), whose sum is σ = 164829280. Its totient is φ = 82341216.

The previous prime is 123566873. The next prime is 123566893. The reversal of 123566889 is 988665321.

It is a happy number.

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

It is not a de Polignac number, because 123566889 - 2⁴ = 123566873 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (123566819) 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 7 ways as a sum of consecutive naturals, for example, 19 + ... + 15720.

It is an arithmetic number, because the mean of its divisors is an integer number (20603660).

Almost surely, 2^123566889 is an apocalyptic number.

It is an amenable number.

123566889 is a deficient number, since it is larger than the sum of its proper divisors (41262391).

123566889 is a wasteful number, since it uses less digits than its factorization.

123566889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18359.

The product of its digits is 622080, while the sum is 48.

The square root of 123566889 is about 11116.0644564522. The cubic root of 123566889 is about 498.0818360375.

The spelling of 123566889 in words is "one hundred twenty-three million, five hundred sixty-six thousand, eight hundred eighty-nine".