123389609 has 4 divisors (see below), whose sum is σ = 141016704. Its totient is φ = 105762516.

The previous prime is 123389599. The next prime is 123389639. The reversal of 123389609 is 906983321.

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 not a de Polignac number, because 123389609 - 2⁴ = 123389593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123389639) 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, 8813537 + ... + 8813550.

It is an arithmetic number, because the mean of its divisors is an integer number (35254176).

Almost surely, 2^123389609 is an apocalyptic number.

It is an amenable number.

123389609 is a deficient number, since it is larger than the sum of its proper divisors (17627095).

123389609 is an equidigital number, since it uses as much as digits as its factorization.

123389609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17627094.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 123389609 is about 11108.0875491688. The cubic root of 123389609 is about 497.8435245989.

The spelling of 123389609 in words is "one hundred twenty-three million, three hundred eighty-nine thousand, six hundred nine".