428889 has 4 divisors (see below), whose sum is σ = 571856. Its totient is φ = 285924.

The previous prime is 428873. The next prime is 428899. The reversal of 428889 is 988824.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 428889 - 2⁴ = 428873 is a prime.

It is a D-number.

It is a Duffinian number.

428889 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (428809) 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, 71479 + ... + 71484.

It is an arithmetic number, because the mean of its divisors is an integer number (142964).

2⁴²⁸⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

428889 is a deficient number, since it is larger than the sum of its proper divisors (142967).

428889 is a wasteful number, since it uses less digits than its factorization.

428889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142966.

The product of its digits is 36864, while the sum is 39.

The square root of 428889 is about 654.8961749774. The cubic root of 428889 is about 75.4133620168.

The spelling of 428889 in words is "four hundred twenty-eight thousand, eight hundred eighty-nine".