428213 has 4 divisors (see below), whose sum is σ = 453420. Its totient is φ = 403008.

The previous prime is 428177. The next prime is 428221. The reversal of 428213 is 312824.

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 380689 + 47524 = 617^2 + 218^2 .

It is a cyclic number.

It is not a de Polignac number, because 428213 - 2⁶ = 428149 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 (428273) 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, 12578 + ... + 12611.

It is an arithmetic number, because the mean of its divisors is an integer number (113355).

2⁴²⁸²¹³ is an apocalyptic number.

It is an amenable number.

428213 is a deficient number, since it is larger than the sum of its proper divisors (25207).

428213 is a wasteful number, since it uses less digits than its factorization.

428213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25206.

The product of its digits is 384, while the sum is 20.

The square root of 428213 is about 654.3798591033. The cubic root of 428213 is about 75.3737198715.

It can be divided in two parts, 42821 and 3, that added together give a palindrome (42824).

The spelling of 428213 in words is "four hundred twenty-eight thousand, two hundred thirteen".