123906 has 16 divisors (see below), whose sum is σ = 251424. Its totient is φ = 40704.

The previous prime is 123887. The next prime is 123911. The reversal of 123906 is 609321.

It is a Curzon number.

It is an unprimeable number.

123906 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 546 + ... + 738.

It is an arithmetic number, because the mean of its divisors is an integer number (15714).

2¹²³⁹⁰⁶ is an apocalyptic number.

123906 is an abundant number, since it is smaller than the sum of its proper divisors (127518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123906 is a wasteful number, since it uses less digits than its factorization.

123906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 123906 is about 352.0028408976. The cubic root of 123906 is about 49.8537057104.

The spelling of 123906 in words is "one hundred twenty-three thousand, nine hundred six".