123015 has 16 divisors (see below), whose sum is σ = 201600. Its totient is φ = 64032.

The previous prime is 123007. The next prime is 123017. The reversal of 123015 is 510321.

It is not a de Polignac number, because 123015 - 2³ = 123007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123017) 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, 816 + ... + 954.

It is an arithmetic number, because the mean of its divisors is an integer number (12600).

2¹²³⁰¹⁵ is an apocalyptic number.

123015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123015 is a deficient number, since it is larger than the sum of its proper divisors (78585).

123015 is a wasteful number, since it uses less digits than its factorization.

123015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206.

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 123015 is about 350.7349426561. The cubic root of 123015 is about 49.7339198724.

Adding to 123015 its reverse (510321), we get a palindrome (633336).

The spelling of 123015 in words is "one hundred twenty-three thousand, fifteen".