128158842 has 32 divisors (see below), whose sum is σ = 295085952. Its totient is φ = 36347904.

The previous prime is 128158817. The next prime is 128158871. The reversal of 128158842 is 248851821.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 128158842.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5383 + ... + 16890.

It is an arithmetic number, because the mean of its divisors is an integer number (9221436).

Almost surely, 2^128158842 is an apocalyptic number.

128158842 is an abundant number, since it is smaller than the sum of its proper divisors (166927110).

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

128158842 is a wasteful number, since it uses less digits than its factorization.

128158842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22422.

The product of its digits is 40960, while the sum is 39.

The square root of 128158842 is about 11320.7262134547. The cubic root of 128158842 is about 504.1768008466.

The spelling of 128158842 in words is "one hundred twenty-eight million, one hundred fifty-eight thousand, eight hundred forty-two".