428839 has 4 divisors (see below), whose sum is σ = 438856. Its totient is φ = 418824.

The previous prime is 428833. The next prime is 428843. The reversal of 428839 is 938824.

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

It is a cyclic number.

It is not a de Polignac number, because 428839 - 2⁵ = 428807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428833) 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, 4944 + ... + 5029.

It is an arithmetic number, because the mean of its divisors is an integer number (109714).

2⁴²⁸⁸³⁹ is an apocalyptic number.

428839 is a deficient number, since it is larger than the sum of its proper divisors (10017).

428839 is an equidigital number, since it uses as much as digits as its factorization.

428839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10016.

The product of its digits is 13824, while the sum is 34.

The square root of 428839 is about 654.8579998748. The cubic root of 428839 is about 75.4104313327.

The spelling of 428839 in words is "four hundred twenty-eight thousand, eight hundred thirty-nine".