12123813 has 8 divisors (see below), whose sum is σ = 17408608. Its totient is φ = 7460784.

The previous prime is 12123773. The next prime is 12123817. The reversal of 12123813 is 31832121.

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

It is not a de Polignac number, because 12123813 - 2⁸ = 12123557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12123813.

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 7 ways as a sum of consecutive naturals, for example, 155395 + ... + 155472.

It is an arithmetic number, because the mean of its divisors is an integer number (2176076).

Almost surely, 2^12123813 is an apocalyptic number.

12123813 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

12123813 is a deficient number, since it is larger than the sum of its proper divisors (5284795).

12123813 is a wasteful number, since it uses less digits than its factorization.

12123813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310883.

The product of its digits is 288, while the sum is 21.

The square root of 12123813 is about 3481.9266218575. The cubic root of 12123813 is about 229.7275475823.

Adding to 12123813 its reverse (31832121), we get a palindrome (43955934).

The spelling of 12123813 in words is "twelve million, one hundred twenty-three thousand, eight hundred thirteen".