123558889 has 4 divisors (see below), whose sum is σ = 123669460. Its totient is φ = 123448320.

The previous prime is 123558769. The next prime is 123558893. The reversal of 123558889 is 988855321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49942489 + 73616400 = 7067^2 + 8580^2 .

It is a cyclic number.

It is not a de Polignac number, because 123558889 - 2⁹ = 123558377 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 (123558899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53592 + ... + 55849.

It is an arithmetic number, because the mean of its divisors is an integer number (30917365).

Almost surely, 2^123558889 is an apocalyptic number.

It is an amenable number.

123558889 is a deficient number, since it is larger than the sum of its proper divisors (110571).

123558889 is a wasteful number, since it uses less digits than its factorization.

123558889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110570.

The product of its digits is 691200, while the sum is 49.

The square root of 123558889 is about 11115.7046110447. The cubic root of 123558889 is about 498.0710868238.

The spelling of 123558889 in words is "one hundred twenty-three million, five hundred fifty-eight thousand, eight hundred eighty-nine".