123320989 has 16 divisors (see below), whose sum is σ = 138458880. Its totient is φ = 108864000.

The previous prime is 123320987. The next prime is 123320999. The reversal of 123320989 is 989023321.

It is a cyclic number.

It is not a de Polignac number, because 123320989 - 2¹ = 123320987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123320987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121717 + ... + 122725.

It is an arithmetic number, because the mean of its divisors is an integer number (8653680).

Almost surely, 2^123320989 is an apocalyptic number.

It is an amenable number.

123320989 is a deficient number, since it is larger than the sum of its proper divisors (15137891).

123320989 is a wasteful number, since it uses less digits than its factorization.

123320989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 123320989 is about 11104.9983791084. The cubic root of 123320989 is about 497.7512198047.

It can be divided in two parts, 1233 and 20989, that added together give a palindrome (22222).

The spelling of 123320989 in words is "one hundred twenty-three million, three hundred twenty thousand, nine hundred eighty-nine".