123915 has 16 divisors (see below), whose sum is σ = 216576. Its totient is φ = 60000.

The previous prime is 123911. The next prime is 123923. The reversal of 123915 is 519321.

It is not a de Polignac number, because 123915 - 2² = 123911 is a prime.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 123891 and 123900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 211 + ... + 540.

It is an arithmetic number, because the mean of its divisors is an integer number (13536).

2¹²³⁹¹⁵ is an apocalyptic number.

123915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123915 is a deficient number, since it is larger than the sum of its proper divisors (92661).

123915 is a wasteful number, since it uses less digits than its factorization.

123915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770.

The product of its digits is 270, while the sum is 21.

The square root of 123915 is about 352.0156246532. The cubic root of 123915 is about 49.8549127343.

The spelling of 123915 in words is "one hundred twenty-three thousand, nine hundred fifteen".