128434 has 4 divisors (see below), whose sum is σ = 192654. Its totient is φ = 64216.

The previous prime is 128431. The next prime is 128437. The reversal of 128434 is 434821.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (128431) and next prime (128437).

It can be written as a sum of positive squares in only one way, i.e., 119025 + 9409 = 345^2 + 97^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (128431) by changing a digit.

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 as a sum of consecutive naturals, namely, 32107 + ... + 32110.

2¹²⁸⁴³⁴ is an apocalyptic number.

128434 is a deficient number, since it is larger than the sum of its proper divisors (64220).

128434 is an equidigital number, since it uses as much as digits as its factorization.

128434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64219.

The product of its digits is 768, while the sum is 22.

The square root of 128434 is about 358.3768965768. The cubic root of 128434 is about 50.4537366721.

The spelling of 128434 in words is "one hundred twenty-eight thousand, four hundred thirty-four".