12720923 has 4 divisors (see below), whose sum is σ = 12753048. Its totient is φ = 12688800.

The previous prime is 12720889. The next prime is 12720941. The reversal of 12720923 is 32902721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32902721 = 1531 ⋅21491.

It is a cyclic number.

It is not a de Polignac number, because 12720923 - 2¹² = 12716827 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12720892 and 12720901.

It is not an unprimeable number, because it can be changed into a prime (12722923) 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, 15461 + ... + 16262.

It is an arithmetic number, because the mean of its divisors is an integer number (3188262).

Almost surely, 2^12720923 is an apocalyptic number.

12720923 is a deficient number, since it is larger than the sum of its proper divisors (32125).

12720923 is an equidigital number, since it uses as much as digits as its factorization.

12720923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32124.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 12720923 is about 3566.6402958527. The cubic root of 12720923 is about 233.4387099996.

The spelling of 12720923 in words is "twelve million, seven hundred twenty thousand, nine hundred twenty-three".