128242 has 8 divisors (see below), whose sum is σ = 197676. Its totient is φ = 62352.

The previous prime is 128239. The next prime is 128257. The reversal of 128242 is 242821.

It can be written as a sum of positive squares in 2 ways, for example, as 123201 + 5041 = 351^2 + 71^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 793 + ... + 940.

2¹²⁸²⁴² is an apocalyptic number.

128242 is a deficient number, since it is larger than the sum of its proper divisors (69434).

128242 is a wasteful number, since it uses less digits than its factorization.

128242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1772.

The product of its digits is 256, while the sum is 19.

The square root of 128242 is about 358.1089219777. The cubic root of 128242 is about 50.4285825109.

It can be divided in two parts, 128 and 242, that multiplied together give a square (30976 = 176²).

The spelling of 128242 in words is "one hundred twenty-eight thousand, two hundred forty-two".