128939158 has 8 divisors (see below), whose sum is σ = 193948560. Its totient is φ = 64289640.

The previous prime is 128939147. The next prime is 128939159. The reversal of 128939158 is 851939821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128939159) 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, 89073 + ... + 90508.

It is an arithmetic number, because the mean of its divisors is an integer number (24243570).

Almost surely, 2^128939158 is an apocalyptic number.

128939158 is a deficient number, since it is larger than the sum of its proper divisors (65009402).

128939158 is a wasteful number, since it uses less digits than its factorization.

128939158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179942.

The product of its digits is 155520, while the sum is 46.

The square root of 128939158 is about 11355.1379560092. The cubic root of 128939158 is about 505.1979853047.

The spelling of 128939158 in words is "one hundred twenty-eight million, nine hundred thirty-nine thousand, one hundred fifty-eight".