428549 has 4 divisors (see below), whose sum is σ = 467520. Its totient is φ = 389580.

The previous prime is 428539. The next prime is 428551. The reversal of 428549 is 945824.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-428549 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19469 + ... + 19490.

It is an arithmetic number, because the mean of its divisors is an integer number (116880).

2⁴²⁸⁵⁴⁹ is an apocalyptic number.

It is an amenable number.

428549 is a deficient number, since it is larger than the sum of its proper divisors (38971).

428549 is a wasteful number, since it uses less digits than its factorization.

428549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38970.

The product of its digits is 11520, while the sum is 32.

The square root of 428549 is about 654.6365403795. The cubic root of 428549 is about 75.3934288705.

It can be divided in two parts, 4285 and 49, that added together give a palindrome (4334).

The spelling of 428549 in words is "four hundred twenty-eight thousand, five hundred forty-nine".