128958047 has 4 divisors (see below), whose sum is σ = 133118016. Its totient is φ = 124798080.

The previous prime is 128958029. The next prime is 128958059. The reversal of 128958047 is 740859821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128958047 - 2¹⁴ = 128941663 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128957989 and 128958007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128958017) 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, 2079938 + ... + 2079999.

It is an arithmetic number, because the mean of its divisors is an integer number (33279504).

Almost surely, 2^128958047 is an apocalyptic number.

128958047 is a deficient number, since it is larger than the sum of its proper divisors (4159969).

128958047 is an equidigital number, since it uses as much as digits as its factorization.

128958047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4159968.

The product of its (nonzero) digits is 161280, while the sum is 44.

The square root of 128958047 is about 11355.9696635734. The cubic root of 128958047 is about 505.2226538356. Note that the first 3 decimals are identical.

The spelling of 128958047 in words is "one hundred twenty-eight million, nine hundred fifty-eight thousand, forty-seven".