123506 has 8 divisors (see below), whose sum is σ = 190380. Its totient is φ = 60048.

The previous prime is 123503. The next prime is 123517. The reversal of 123506 is 605321.

It can be written as a sum of positive squares in 2 ways, for example, as 116281 + 7225 = 341^2 + 85^2 .

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

It is not an unprimeable number, because it can be changed into a prime (123503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 761 + ... + 908.

2¹²³⁵⁰⁶ is an apocalyptic number.

123506 is a deficient number, since it is larger than the sum of its proper divisors (66874).

123506 is a wasteful number, since it uses less digits than its factorization.

123506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1708.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 123506 is about 351.4342043683. The cubic root of 123506 is about 49.8000010753.

Adding to 123506 its reverse (605321), we get a palindrome (728827).

The spelling of 123506 in words is "one hundred twenty-three thousand, five hundred six".