123320689 has 4 divisors (see below), whose sum is σ = 126188656. Its totient is φ = 120452724.

The previous prime is 123320651. The next prime is 123320693. The reversal of 123320689 is 986023321.

It is a happy number.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123320689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123320699) 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, 1433919 + ... + 1434004.

It is an arithmetic number, because the mean of its divisors is an integer number (31547164).

Almost surely, 2^123320689 is an apocalyptic number.

It is an amenable number.

123320689 is a deficient number, since it is larger than the sum of its proper divisors (2867967).

123320689 is an equidigital number, since it uses as much as digits as its factorization.

123320689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2867966.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 123320689 is about 11104.9848716691. The cubic root of 123320689 is about 497.7508161820.

The spelling of 123320689 in words is "one hundred twenty-three million, three hundred twenty thousand, six hundred eighty-nine".