128942 has 8 divisors (see below), whose sum is σ = 211032. Its totient is φ = 58600.

The previous prime is 128941. The next prime is 128951. The reversal of 128942 is 249821.

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

It is an Ulam number.

It is a d-powerful number, because it can be written as 1 + 2⁸ + 9⁵ + 8⁴ + 4 + 2¹⁶ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128941) 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, 2909 + ... + 2952.

It is an arithmetic number, because the mean of its divisors is an integer number (26379).

2¹²⁸⁹⁴² is an apocalyptic number.

128942 is a deficient number, since it is larger than the sum of its proper divisors (82090).

128942 is a wasteful number, since it uses less digits than its factorization.

128942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5874.

The product of its digits is 1152, while the sum is 26.

The square root of 128942 is about 359.0849481669. The cubic root of 128942 is about 50.5201697035.

It can be divided in two parts, 1289 and 42, that added together give a palindrome (1331).

The spelling of 128942 in words is "one hundred twenty-eight thousand, nine hundred forty-two".