428905 has 4 divisors (see below), whose sum is σ = 514692. Its totient is φ = 343120.

The previous prime is 428899. The next prime is 428951. The reversal of 428905 is 509824.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 290521 + 138384 = 539^2 + 372^2 .

It is not a de Polignac number, because 428905 - 2⁵ = 428873 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42886 + ... + 42895.

It is an arithmetic number, because the mean of its divisors is an integer number (128673).

2⁴²⁸⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

428905 is a deficient number, since it is larger than the sum of its proper divisors (85787).

428905 is an equidigital number, since it uses as much as digits as its factorization.

428905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85786.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 428905 is about 654.9083905402. The cubic root of 428905 is about 75.4142997877.

The spelling of 428905 in words is "four hundred twenty-eight thousand, nine hundred five".