123615 has 24 divisors (see below), whose sum is σ = 222768. Its totient is φ = 63360.

The previous prime is 123601. The next prime is 123619. The reversal of 123615 is 516321.

It is not a de Polignac number, because 123615 - 2⁵ = 123583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123619) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1812 + ... + 1878.

It is an arithmetic number, because the mean of its divisors is an integer number (9282).

2¹²³⁶¹⁵ is an apocalyptic number.

123615 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123615 is a deficient number, since it is larger than the sum of its proper divisors (99153).

123615 is a wasteful number, since it uses less digits than its factorization.

123615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119 (or 116 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 123615 is about 351.5892489824. The cubic root of 123615 is about 49.8146470682.

Adding to 123615 its reverse (516321), we get a palindrome (639936).

The spelling of 123615 in words is "one hundred twenty-three thousand, six hundred fifteen".