123939 has 12 divisors (see below), whose sum is σ = 183456. Its totient is φ = 80592.

The previous prime is 123931. The next prime is 123941. The reversal of 123939 is 939321.

123939 = T₈₂ + T₈₃ + ... + T₁₀₈.

It is not a de Polignac number, because 123939 - 2³ = 123931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123931) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 277 + ... + 569.

It is an arithmetic number, because the mean of its divisors is an integer number (15288).

2¹²³⁹³⁹ is an apocalyptic number.

123939 is a deficient number, since it is larger than the sum of its proper divisors (59517).

123939 is a wasteful number, since it uses less digits than its factorization.

123939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346 (or 343 counting only the distinct ones).

The product of its digits is 1458, while the sum is 27.

The square root of 123939 is about 352.0497123987. The cubic root of 123939 is about 49.8581311788.

The spelling of 123939 in words is "one hundred twenty-three thousand, nine hundred thirty-nine".