128806423 has 4 divisors (see below), whose sum is σ = 129319848. Its totient is φ = 128293000.

The previous prime is 128806409. The next prime is 128806451. The reversal of 128806423 is 324608821.

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 128806423 - 2¹³ = 128798231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128806723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256336 + ... + 256837.

It is an arithmetic number, because the mean of its divisors is an integer number (32329962).

Almost surely, 2^128806423 is an apocalyptic number.

128806423 is a deficient number, since it is larger than the sum of its proper divisors (513425).

128806423 is an equidigital number, since it uses as much as digits as its factorization.

128806423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513424.

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 128806423 is about 11349.2917400162. The cubic root of 128806423 is about 505.0245689448.

The spelling of 128806423 in words is "one hundred twenty-eight million, eight hundred six thousand, four hundred twenty-three".