123648309 has 8 divisors (see below), whose sum is σ = 183182720. Its totient is φ = 82432188.

The previous prime is 123648277. The next prime is 123648319. The reversal of 123648309 is 903846321.

123648309 is a `hidden beast` number, since 1 + 2 + 3 + 648 + 3 + 0 + 9 = 666.

It is not a de Polignac number, because 123648309 - 2⁵ = 123648277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123648319) 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 7 ways as a sum of consecutive naturals, for example, 2289757 + ... + 2289810.

It is an arithmetic number, because the mean of its divisors is an integer number (22897840).

Almost surely, 2^123648309 is an apocalyptic number.

It is an amenable number.

123648309 is a deficient number, since it is larger than the sum of its proper divisors (59534411).

123648309 is an equidigital number, since it uses as much as digits as its factorization.

123648309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4579576 (or 4579570 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 123648309 is about 11119.7261207280. The cubic root of 123648309 is about 498.1912097797.

The spelling of 123648309 in words is "one hundred twenty-three million, six hundred forty-eight thousand, three hundred nine".