128947 has 12 divisors (see below), whose sum is σ = 161040. Its totient is φ = 101088.

The previous prime is 128941. The next prime is 128951. The reversal of 128947 is 749821.

It is not a de Polignac number, because 128947 - 2³ = 128939 is a prime.

It is a d-powerful number, because it can be written as 1 + 2⁷ + 9⁴ + 8³ + 4⁶ + 7⁶ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1129 + ... + 1237.

It is an arithmetic number, because the mean of its divisors is an integer number (13420).

2¹²⁸⁹⁴⁷ is an apocalyptic number.

128947 is a deficient number, since it is larger than the sum of its proper divisors (32093).

128947 is a wasteful number, since it uses less digits than its factorization.

128947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 129 counting only the distinct ones).

The product of its digits is 4032, while the sum is 31.

The square root of 128947 is about 359.0919102403. The cubic root of 128947 is about 50.5208227040.

The spelling of 128947 in words is "one hundred twenty-eight thousand, nine hundred forty-seven".