123555889 has 4 divisors (see below), whose sum is σ = 123578356. Its totient is φ = 123533424.

The previous prime is 123555871. The next prime is 123555907. The reversal of 123555889 is 988555321.

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

It is an interprime number because it is at equal distance from previous prime (123555871) and next prime (123555907).

It can be written as a sum of positive squares in 2 ways, for example, as 88981489 + 34574400 = 9433^2 + 5880^2 .

It is a cyclic number.

It is not a de Polignac number, because 123555889 - 2⁵ = 123555857 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 (123555989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3187 + ... + 16039.

It is an arithmetic number, because the mean of its divisors is an integer number (30894589).

Almost surely, 2^123555889 is an apocalyptic number.

It is an amenable number.

123555889 is a deficient number, since it is larger than the sum of its proper divisors (22467).

123555889 is an equidigital number, since it uses as much as digits as its factorization.

123555889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22466.

The product of its digits is 432000, while the sum is 46.

The square root of 123555889 is about 11115.5696660135. The cubic root of 123555889 is about 498.0670557491.

The spelling of 123555889 in words is "one hundred twenty-three million, five hundred fifty-five thousand, eight hundred eighty-nine".