12128947 has 2 divisors, whose sum is σ = 12128948. Its totient is φ = 12128946.

The previous prime is 12128929. The next prime is 12128957. The reversal of 12128947 is 74982121.

12128947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12128947 - 2⁷ = 12128819 is a prime.

It is a super-2 number, since 2×12128947² = 294222710657618, which contains 22 as substring.

It is a plaindrome in base 13.

It is not a weakly prime, because it can be changed into another prime (12128917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6064473 + 6064474.

It is an arithmetic number, because the mean of its divisors is an integer number (6064474).

Almost surely, 2^12128947 is an apocalyptic number.

12128947 is a deficient number, since it is larger than the sum of its proper divisors (1).

12128947 is an equidigital number, since it uses as much as digits as its factorization.

12128947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 34.

The square root of 12128947 is about 3482.6637793505. The cubic root of 12128947 is about 229.7599701319.

The spelling of 12128947 in words is "twelve million, one hundred twenty-eight thousand, nine hundred forty-seven".