123505729747 has 8 divisors (see below), whose sum is σ = 124492476416. Its totient is φ = 122519206152.

The previous prime is 123505729741. The next prime is 123505729757. The reversal of 123505729747 is 747927505321.

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 123505729747 - 2⁷ = 123505729619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123505729694 and 123505729703.

It is not an unprimeable number, because it can be changed into a prime (123505729741) 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, 1161538 + ... + 1263400.

It is an arithmetic number, because the mean of its divisors is an integer number (15561559552).

Almost surely, 2^123505729747 is an apocalyptic number.

123505729747 is a deficient number, since it is larger than the sum of its proper divisors (986746669).

123505729747 is a wasteful number, since it uses less digits than its factorization.

123505729747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111537.

The product of its (nonzero) digits is 3704400, while the sum is 52.

The spelling of 123505729747 in words is "one hundred twenty-three billion, five hundred five million, seven hundred twenty-nine thousand, seven hundred forty-seven".