123440321 has 4 divisors (see below), whose sum is σ = 129937200. Its totient is φ = 116943444.

The previous prime is 123440279. The next prime is 123440323. The reversal of 123440321 is 123044321.

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, and also an emirpimes, since its reverse is a distinct semiprime: 123044321 = 41 ⋅3001081.

It is a cyclic number.

It is not a de Polignac number, because 123440321 - 2⁶ = 123440257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123440293 and 123440302.

It is not an unprimeable number, because it can be changed into a prime (123440323) 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, 3248411 + ... + 3248448.

It is an arithmetic number, because the mean of its divisors is an integer number (32484300).

Almost surely, 2^123440321 is an apocalyptic number.

It is an amenable number.

123440321 is a deficient number, since it is larger than the sum of its proper divisors (6496879).

123440321 is an equidigital number, since it uses as much as digits as its factorization.

123440321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6496878.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 123440321 is about 11110.3699758379. The cubic root of 123440321 is about 497.9117183015.

Adding to 123440321 its reverse (123044321), we get a palindrome (246484642).

The spelling of 123440321 in words is "one hundred twenty-three million, four hundred forty thousand, three hundred twenty-one".