12699823 has 4 divisors (see below), whose sum is σ = 12970080. Its totient is φ = 12429568.

The previous prime is 12699821. The next prime is 12699829. The reversal of 12699823 is 32899621.

It is a happy number.

12699823 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32899621 = 19 ⋅1731559.

It is a cyclic number.

It is not a de Polignac number, because 12699823 - 2¹ = 12699821 is a prime.

It is a super-2 number, since 2×12699823² = 322571008462658, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12699821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135058 + ... + 135151.

It is an arithmetic number, because the mean of its divisors is an integer number (3242520).

Almost surely, 2^12699823 is an apocalyptic number.

12699823 is a deficient number, since it is larger than the sum of its proper divisors (270257).

12699823 is an equidigital number, since it uses as much as digits as its factorization.

12699823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270256.

The product of its digits is 46656, while the sum is 40.

The square root of 12699823 is about 3563.6811024557. The cubic root of 12699823 is about 233.3095715032.

The spelling of 12699823 in words is "twelve million, six hundred ninety-nine thousand, eight hundred twenty-three".