428185 has 8 divisors (see below), whose sum is σ = 531720. Its totient is φ = 330624.

The previous prime is 428177. The next prime is 428221. The reversal of 428185 is 581824.

It can be written as a sum of positive squares in 4 ways, for example, as 99856 + 328329 = 316^2 + 573^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 428185 - 2³ = 428177 is a prime.

428185 is a lucky number.

It is a plaindrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1332 + ... + 1621.

It is an arithmetic number, because the mean of its divisors is an integer number (66465).

2⁴²⁸¹⁸⁵ is an apocalyptic number.

It is an amenable number.

428185 is a deficient number, since it is larger than the sum of its proper divisors (103535).

428185 is a wasteful number, since it uses less digits than its factorization.

428185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2987.

The product of its digits is 2560, while the sum is 28.

The square root of 428185 is about 654.3584644520. The cubic root of 428185 is about 75.3720769896.

The spelling of 428185 in words is "four hundred twenty-eight thousand, one hundred eighty-five".