123005647 has 4 divisors (see below), whose sum is σ = 123101496. Its totient is φ = 122909800.

The previous prime is 123005629. The next prime is 123005651. The reversal of 123005647 is 746500321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123005647 - 2¹¹ = 123003599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123005347) 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 3 ways as a sum of consecutive naturals, for example, 45973 + ... + 48574.

It is an arithmetic number, because the mean of its divisors is an integer number (30775374).

Almost surely, 2^123005647 is an apocalyptic number.

123005647 is a deficient number, since it is larger than the sum of its proper divisors (95849).

123005647 is an equidigital number, since it uses as much as digits as its factorization.

123005647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95848.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 123005647 is about 11090.7910899088. The cubic root of 123005647 is about 497.3265939429.

Adding to 123005647 its reverse (746500321), we get a palindrome (869505968).

The spelling of 123005647 in words is "one hundred twenty-three million, five thousand, six hundred forty-seven".