123644321 has 4 divisors (see below), whose sum is σ = 123909552. Its totient is φ = 123379092.

The previous prime is 123644309. The next prime is 123644333. The reversal of 123644321 is 123446321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (123644309) and next prime (123644333).

It is a cyclic number.

It is not a de Polignac number, because 123644321 - 2¹⁰ = 123643297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123644341) 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, 131915 + ... + 132848.

It is an arithmetic number, because the mean of its divisors is an integer number (30977388).

Almost surely, 2^123644321 is an apocalyptic number.

It is an amenable number.

123644321 is a deficient number, since it is larger than the sum of its proper divisors (265231).

123644321 is an equidigital number, since it uses as much as digits as its factorization.

123644321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265230.

The product of its digits is 3456, while the sum is 26.

The square root of 123644321 is about 11119.5467983187. The cubic root of 123644321 is about 498.1858537072.

The spelling of 123644321 in words is "one hundred twenty-three million, six hundred forty-four thousand, three hundred twenty-one".