128478443 has 2 divisors, whose sum is σ = 128478444. Its totient is φ = 128478442.

The previous prime is 128478433. The next prime is 128478479. The reversal of 128478443 is 344874821.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128478443 - 2¹⁸ = 128216299 is a prime.

It is equal to p_7296575 and since 128478443 and 7296575 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128478443.

It is not a weakly prime, because it can be changed into another prime (128478433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64239221 + 64239222.

It is an arithmetic number, because the mean of its divisors is an integer number (64239222).

Almost surely, 2^128478443 is an apocalyptic number.

128478443 is a deficient number, since it is larger than the sum of its proper divisors (1).

128478443 is an equidigital number, since it uses as much as digits as its factorization.

128478443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172032, while the sum is 41.

The square root of 128478443 is about 11334.8331703647. The cubic root of 128478443 is about 504.5955563187.

The spelling of 128478443 in words is "one hundred twenty-eight million, four hundred seventy-eight thousand, four hundred forty-three".