12815123 has 4 divisors (see below), whose sum is σ = 12837048. Its totient is φ = 12793200.

The previous prime is 12815119. The next prime is 12815137. The reversal of 12815123 is 32151821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32151821 = 13 ⋅2473217.

It is a cyclic number.

It is not a de Polignac number, because 12815123 - 2² = 12815119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12815113) 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 3 ways as a sum of consecutive naturals, for example, 10061 + ... + 11262.

It is an arithmetic number, because the mean of its divisors is an integer number (3209262).

Almost surely, 2^12815123 is an apocalyptic number.

12815123 is a deficient number, since it is larger than the sum of its proper divisors (21925).

12815123 is an equidigital number, since it uses as much as digits as its factorization.

12815123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21924.

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

The square root of 12815123 is about 3579.8216436018. The cubic root of 12815123 is about 234.0135076333.

Adding to 12815123 its reverse (32151821), we get a palindrome (44966944).

It can be divided in two parts, 128 and 15123, that added together give a palindrome (15251).

The spelling of 12815123 in words is "twelve million, eight hundred fifteen thousand, one hundred twenty-three".