12905947 has 4 divisors (see below), whose sum is σ = 13039096. Its totient is φ = 12772800.

The previous prime is 12905923. The next prime is 12905969. The reversal of 12905947 is 74950921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74950921 = 8123 ⋅9227.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12905947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12905647) 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, 66429 + ... + 66622.

It is an arithmetic number, because the mean of its divisors is an integer number (3259774).

Almost surely, 2^12905947 is an apocalyptic number.

12905947 is a deficient number, since it is larger than the sum of its proper divisors (133149).

12905947 is an equidigital number, since it uses as much as digits as its factorization.

12905947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133148.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 12905947 is about 3592.4847946790. The cubic root of 12905947 is about 234.5650442481.

The spelling of 12905947 in words is "twelve million, nine hundred five thousand, nine hundred forty-seven".