128446429 has 4 divisors (see below), whose sum is σ = 128546460. Its totient is φ = 128346400.

The previous prime is 128446411. The next prime is 128446471. The reversal of 128446429 is 924644821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 924644821 = 773 ⋅1196177.

It can be written as a sum of positive squares in 2 ways, for example, as 11222500 + 117223929 = 3350^2 + 10827^2 .

It is a cyclic number.

It is not a de Polignac number, because 128446429 - 2⁵ = 128446397 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128446391 and 128446400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128446229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48064 + ... + 50665.

It is an arithmetic number, because the mean of its divisors is an integer number (32136615).

Almost surely, 2^128446429 is an apocalyptic number.

It is an amenable number.

128446429 is a deficient number, since it is larger than the sum of its proper divisors (100031).

128446429 is an equidigital number, since it uses as much as digits as its factorization.

128446429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100030.

The product of its digits is 110592, while the sum is 40.

The square root of 128446429 is about 11333.4208869167. The cubic root of 128446429 is about 504.5536414685.

The spelling of 128446429 in words is "one hundred twenty-eight million, four hundred forty-six thousand, four hundred twenty-nine".