123647 has 4 divisors (see below), whose sum is σ = 125736. Its totient is φ = 121560.

The previous prime is 123637. The next prime is 123653. The reversal of 123647 is 746321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 746321 = 523 ⋅1427.

It is a cyclic number.

It is not a de Polignac number, because 123647 - 2⁴ = 123631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 123647.

It is not an unprimeable number, because it can be changed into a prime (123637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 953 + ... + 1074.

It is an arithmetic number, because the mean of its divisors is an integer number (31434).

2¹²³⁶⁴⁷ is an apocalyptic number.

123647 is a deficient number, since it is larger than the sum of its proper divisors (2089).

123647 is an equidigital number, since it uses as much as digits as its factorization.

123647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2088.

The product of its digits is 1008, while the sum is 23.

The square root of 123647 is about 351.6347536863. The cubic root of 123647 is about 49.8189451744.

Adding to 123647 its reverse (746321), we get a palindrome (869968).

The spelling of 123647 in words is "one hundred twenty-three thousand, six hundred forty-seven".