123644609 has 8 divisors (see below), whose sum is σ = 141984480. Its totient is φ = 106488000.

The previous prime is 123644579. The next prime is 123644611. The reversal of 123644609 is 906446321.

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

It is a cyclic number.

It is not a de Polignac number, because 123644609 - 2¹² = 123640513 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (123644659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 295592 + ... + 296009.

It is an arithmetic number, because the mean of its divisors is an integer number (17748060).

Almost surely, 2^123644609 is an apocalyptic number.

123644609 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

123644609 is a deficient number, since it is larger than the sum of its proper divisors (18339871).

123644609 is a wasteful number, since it uses less digits than its factorization.

123644609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591631.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 123644609 is about 11119.5597484793. The cubic root of 123644609 is about 498.1862405087.

The spelling of 123644609 in words is "one hundred twenty-three million, six hundred forty-four thousand, six hundred nine".