428381 has 4 divisors (see below), whose sum is σ = 429792. Its totient is φ = 426972.

The previous prime is 428369. The next prime is 428401. The reversal of 428381 is 183824.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 428381 - 2¹⁸ = 166237 is a prime.

It is a super-2 number, since 2×428381² = 367020562322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 428381.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 428381.

It is not an unprimeable number, because it can be changed into a prime (421381) 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, 41 + ... + 926.

It is an arithmetic number, because the mean of its divisors is an integer number (107448).

2⁴²⁸³⁸¹ is an apocalyptic number.

It is an amenable number.

428381 is a deficient number, since it is larger than the sum of its proper divisors (1411).

428381 is an equidigital number, since it uses as much as digits as its factorization.

428381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1410.

The product of its digits is 1536, while the sum is 26.

The square root of 428381 is about 654.5082123243. The cubic root of 428381 is about 75.3835756593.

The spelling of 428381 in words is "four hundred twenty-eight thousand, three hundred eighty-one".