123643289 has 8 divisors (see below), whose sum is σ = 154152768. Its totient is φ = 96345360.

The previous prime is 123643271. The next prime is 123643297. The reversal of 123643289 is 982346321.

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

It is a cyclic number.

It is not a de Polignac number, because 123643289 - 2²⁰ = 122594713 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (123643489) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 802802 + ... + 802955.

It is an arithmetic number, because the mean of its divisors is an integer number (19269096).

Almost surely, 2^123643289 is an apocalyptic number.

It is an amenable number.

123643289 is a deficient number, since it is larger than the sum of its proper divisors (30509479).

123643289 is a wasteful number, since it uses less digits than its factorization.

123643289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1605775.

The product of its digits is 62208, while the sum is 38.

The square root of 123643289 is about 11119.5003934529. The cubic root of 123643289 is about 498.1844676637.

The spelling of 123643289 in words is "one hundred twenty-three million, six hundred forty-three thousand, two hundred eighty-nine".