13128947 has 8 divisors (see below), whose sum is σ = 14970816. Its totient is φ = 11405952.

The previous prime is 13128923. The next prime is 13128949. The reversal of 13128947 is 74982131.

13128947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13128947 - 2¹² = 13124851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13128949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29483 + ... + 29924.

It is an arithmetic number, because the mean of its divisors is an integer number (1871352).

Almost surely, 2^13128947 is an apocalyptic number.

13128947 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

13128947 is a deficient number, since it is larger than the sum of its proper divisors (1841869).

13128947 is a wasteful number, since it uses less digits than its factorization.

13128947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59437.

The product of its digits is 12096, while the sum is 35.

The square root of 13128947 is about 3623.3888833522. The cubic root of 13128947 is about 235.9083420277.

The spelling of 13128947 in words is "thirteen million, one hundred twenty-eight thousand, nine hundred forty-seven".