123506729 has 8 divisors (see below), whose sum is σ = 125460192. Its totient is φ = 121560480.

The previous prime is 123506699. The next prime is 123506731. The reversal of 123506729 is 927605321.

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-123506729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123506749) 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, 40202 + ... + 43164.

It is an arithmetic number, because the mean of its divisors is an integer number (15682524).

Almost surely, 2^123506729 is an apocalyptic number.

It is an amenable number.

123506729 is a deficient number, since it is larger than the sum of its proper divisors (1953463).

123506729 is an equidigital number, since it uses as much as digits as its factorization.

123506729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3607.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 123506729 is about 11113.3581333457. The cubic root of 123506729 is about 498.0009905735. Note that the first 3 decimals are identical.

The spelling of 123506729 in words is "one hundred twenty-three million, five hundred six thousand, seven hundred twenty-nine".