123666321 has 8 divisors (see below), whose sum is σ = 169345024. Its totient is φ = 80215920.

The previous prime is 123666293. The next prime is 123666329.

123666321 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 123666321 - 2⁹ = 123665809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123666329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 556945 + ... + 557166.

It is an arithmetic number, because the mean of its divisors is an integer number (21168128).

Almost surely, 2^123666321 is an apocalyptic number.

It is an amenable number.

123666321 is a deficient number, since it is larger than the sum of its proper divisors (45678703).

123666321 is a wasteful number, since it uses less digits than its factorization.

123666321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1114151.

The product of its digits is 7776, while the sum is 30.

The square root of 123666321 is about 11120.5360032689. The cubic root of 123666321 is about 498.2153993122.

The spelling of 123666321 in words is "one hundred twenty-three million, six hundred sixty-six thousand, three hundred twenty-one".