128849123 has 4 divisors (see below), whose sum is σ = 138760608. Its totient is φ = 118937640.

The previous prime is 128849099. The next prime is 128849131. The reversal of 128849123 is 321948821.

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 128849123 - 2²² = 124654819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128849143) 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, 4955723 + ... + 4955748.

It is an arithmetic number, because the mean of its divisors is an integer number (34690152).

Almost surely, 2^128849123 is an apocalyptic number.

128849123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

128849123 is a deficient number, since it is larger than the sum of its proper divisors (9911485).

128849123 is an equidigital number, since it uses as much as digits as its factorization.

128849123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9911484.

The product of its digits is 27648, while the sum is 38.

The square root of 128849123 is about 11351.1727587946. The cubic root of 128849123 is about 505.0803688708.

The spelling of 128849123 in words is "one hundred twenty-eight million, eight hundred forty-nine thousand, one hundred twenty-three".