428331 has 8 divisors (see below), whose sum is σ = 579904. Its totient is φ = 281160.

The previous prime is 428303. The next prime is 428339. The reversal of 428331 is 133824.

It is a happy number.

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

It is not a de Polignac number, because 428331 - 2⁵ = 428299 is a prime.

It is a super-2 number, since 2×428331² = 366934891122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 428298 and 428307.

It is not an unprimeable number, because it can be changed into a prime (428339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 865 + ... + 1266.

It is an arithmetic number, because the mean of its divisors is an integer number (72488).

2⁴²⁸³³¹ is an apocalyptic number.

428331 is a deficient number, since it is larger than the sum of its proper divisors (151573).

428331 is a wasteful number, since it uses less digits than its factorization.

428331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2201.

The product of its digits is 576, while the sum is 21.

The square root of 428331 is about 654.4700145920. The cubic root of 428331 is about 75.3806426585.

The spelling of 428331 in words is "four hundred twenty-eight thousand, three hundred thirty-one".