12123815 has 16 divisors (see below), whose sum is σ = 15996960. Its totient is φ = 8747520.

The previous prime is 12123773. The next prime is 12123817. The reversal of 12123815 is 51832121.

It is a happy number.

It is not a de Polignac number, because 12123815 - 2⁶ = 12123751 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123817) 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, 6731 + ... + 8339.

It is an arithmetic number, because the mean of its divisors is an integer number (999810).

Almost surely, 2^12123815 is an apocalyptic number.

12123815 is a deficient number, since it is larger than the sum of its proper divisors (3873145).

12123815 is a wasteful number, since it uses less digits than its factorization.

12123815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1762.

The product of its digits is 480, while the sum is 23.

The square root of 12123815 is about 3481.9269090548. The cubic root of 12123815 is about 229.7275602146.

Adding to 12123815 its reverse (51832121), we get a palindrome (63955936).

The spelling of 12123815 in words is "twelve million, one hundred twenty-three thousand, eight hundred fifteen".