123928709 has 8 divisors (see below), whose sum is σ = 127519392. Its totient is φ = 120370320.

The previous prime is 123928699. The next prime is 123928729. The reversal of 123928709 is 907829321.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123928709 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 (123928729) 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, 179 + ... + 15744.

It is an arithmetic number, because the mean of its divisors is an integer number (15939924).

Almost surely, 2^123928709 is an apocalyptic number.

It is an amenable number.

123928709 is a deficient number, since it is larger than the sum of its proper divisors (3590683).

123928709 is a wasteful number, since it uses less digits than its factorization.

123928709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16147.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 123928709 is about 11132.3272050367. The cubic root of 123928709 is about 498.5675118749.

The spelling of 123928709 in words is "one hundred twenty-three million, nine hundred twenty-eight thousand, seven hundred nine".