128429 has 6 divisors (see below), whose sum is σ = 149454. Its totient is φ = 110040.

The previous prime is 128413. The next prime is 128431. The reversal of 128429 is 924821.

It can be written as a sum of positive squares in only one way, i.e., 122500 + 5929 = 350^2 + 77^2 .

It is not a de Polignac number, because 128429 - 2⁴ = 128413 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 128398 and 128407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128449) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1262 + ... + 1359.

It is an arithmetic number, because the mean of its divisors is an integer number (24909).

2¹²⁸⁴²⁹ is an apocalyptic number.

It is an amenable number.

128429 is a deficient number, since it is larger than the sum of its proper divisors (21025).

128429 is an equidigital number, since it uses as much as digits as its factorization.

128429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2635 (or 2628 counting only the distinct ones).

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

The square root of 128429 is about 358.3699206128. The cubic root of 128429 is about 50.4530819339.

The spelling of 128429 in words is "one hundred twenty-eight thousand, four hundred twenty-nine".