128849423 has 4 divisors (see below), whose sum is σ = 133005888. Its totient is φ = 124692960.

The previous prime is 128849417. The next prime is 128849521. The reversal of 128849423 is 324948821.

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 128849423 - 2¹⁰ = 128848399 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 (128849023) 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, 2078186 + ... + 2078247.

It is an arithmetic number, because the mean of its divisors is an integer number (33251472).

Almost surely, 2^128849423 is an apocalyptic number.

128849423 is a deficient number, since it is larger than the sum of its proper divisors (4156465).

128849423 is an equidigital number, since it uses as much as digits as its factorization.

128849423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4156464.

The product of its digits is 110592, while the sum is 41.

The square root of 128849423 is about 11351.1859732805. The cubic root of 128849423 is about 505.0807608642.

The spelling of 128849423 in words is "one hundred twenty-eight million, eight hundred forty-nine thousand, four hundred twenty-three".