128422 has 8 divisors (see below), whose sum is σ = 220176. Its totient is φ = 55032.

The previous prime is 128413. The next prime is 128431. The reversal of 128422 is 224821.

It is an interprime number because it is at equal distance from previous prime (128413) and next prime (128431).

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

It is a self number, because there is not a number n which added to its sum of digits gives 128422.

It is a congruent number.

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, 4573 + ... + 4600.

It is an arithmetic number, because the mean of its divisors is an integer number (27522).

2¹²⁸⁴²² is an apocalyptic number.

128422 is a deficient number, since it is larger than the sum of its proper divisors (91754).

128422 is an equidigital number, since it uses as much as digits as its factorization.

128422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9182.

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

The square root of 128422 is about 358.3601540350. The cubic root of 128422 is about 50.4521652718.

The spelling of 128422 in words is "one hundred twenty-eight thousand, four hundred twenty-two".