123515 has 8 divisors (see below), whose sum is σ = 169440. Its totient is φ = 84672.

The previous prime is 123503. The next prime is 123517. The reversal of 123515 is 515321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 123515 - 2⁴ = 123499 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123493 and 123502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1730 + ... + 1799.

It is an arithmetic number, because the mean of its divisors is an integer number (21180).

2¹²³⁵¹⁵ is an apocalyptic number.

123515 is a deficient number, since it is larger than the sum of its proper divisors (45925).

123515 is an equidigital number, since it uses as much as digits as its factorization.

123515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3541.

The product of its digits is 150, while the sum is 17.

The square root of 123515 is about 351.4470088079. The cubic root of 123515 is about 49.8012107037.

Adding to 123515 its reverse (515321), we get a palindrome (638836).

The spelling of 123515 in words is "one hundred twenty-three thousand, five hundred fifteen".