123507609 has 16 divisors (see below), whose sum is σ = 166937472. Its totient is φ = 81214848.

The previous prime is 123507577. The next prime is 123507623. The reversal of 123507609 is 906705321.

It is not a de Polignac number, because 123507609 - 2⁵ = 123507577 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123507609.

It is not an unprimeable number, because it can be changed into a prime (123507679) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96079 + ... + 97355.

It is an arithmetic number, because the mean of its divisors is an integer number (10433592).

Almost surely, 2^123507609 is an apocalyptic number.

It is an amenable number.

123507609 is a deficient number, since it is larger than the sum of its proper divisors (43429863).

123507609 is a wasteful number, since it uses less digits than its factorization.

123507609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1696.

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 123507609 is about 11113.3977252684. The cubic root of 123507609 is about 498.0021733426.

The spelling of 123507609 in words is "one hundred twenty-three million, five hundred seven thousand, six hundred nine".