123539 has 12 divisors (see below), whose sum is σ = 144936. Its totient is φ = 104832.

The previous prime is 123527. The next prime is 123547. The reversal of 123539 is 935321.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-123539 is a prime.

It is a Smith number, since the sum of its digits (23) coincides with the sum of the digits of its prime factors.

It is a d-powerful number, because it can be written as 1 + 2⁷ + 5⁵ + 3⁷ + 3¹⁰ + 9⁵ .

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123239) 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, 2852 + ... + 2894.

It is an arithmetic number, because the mean of its divisors is an integer number (12078).

2¹²³⁵³⁹ is an apocalyptic number.

123539 is a deficient number, since it is larger than the sum of its proper divisors (21397).

123539 is a wasteful number, since it uses less digits than its factorization.

123539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86 (or 73 counting only the distinct ones).

The product of its digits is 810, while the sum is 23.

The square root of 123539 is about 351.4811516995. The cubic root of 123539 is about 49.8044360924.

The spelling of 123539 in words is "one hundred twenty-three thousand, five hundred thirty-nine".