12689723 has 4 divisors (see below), whose sum is σ = 12763248. Its totient is φ = 12616200.

The previous prime is 12689711. The next prime is 12689731. The reversal of 12689723 is 32798621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12689723 - 2¹⁰ = 12688699 is a prime.

It is a super-2 number, since 2×12689723² = 322058139633458, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12689783) 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, 36503 + ... + 36848.

It is an arithmetic number, because the mean of its divisors is an integer number (3190812).

Almost surely, 2^12689723 is an apocalyptic number.

12689723 is a deficient number, since it is larger than the sum of its proper divisors (73525).

12689723 is an equidigital number, since it uses as much as digits as its factorization.

12689723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73524.

The product of its digits is 36288, while the sum is 38.

The square root of 12689723 is about 3562.2637465522. The cubic root of 12689723 is about 233.2477057689.

The spelling of 12689723 in words is "twelve million, six hundred eighty-nine thousand, seven hundred twenty-three".