128508942 has 8 divisors (see below), whose sum is σ = 257017896. Its totient is φ = 42836312.

The previous prime is 128508907. The next prime is 128508943. The reversal of 128508942 is 249805821.

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

128508942 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 128508942.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128508943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10709073 + ... + 10709084.

It is an arithmetic number, because the mean of its divisors is an integer number (32127237).

Almost surely, 2^128508942 is an apocalyptic number.

128508942 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128508942 is a wasteful number, since it uses less digits than its factorization.

128508942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21418162.

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 128508942 is about 11336.1784566052. The cubic root of 128508942 is about 504.6354811546.

The spelling of 128508942 in words is "one hundred twenty-eight million, five hundred eight thousand, nine hundred forty-two".