819428 has 6 divisors (see below), whose sum is σ = 1434006. Its totient is φ = 409712.

The previous prime is 819419. The next prime is 819431. The reversal of 819428 is 824918.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 529984 + 289444 = 728^2 + 538^2 .

It is a junction number, because it is equal to n+sod(n) for n = 819394 and 819403.

It is an unprimeable number.

819428 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 102425 + ... + 102432.

It is an arithmetic number, because the mean of its divisors is an integer number (239001).

2⁸¹⁹⁴²⁸ is an apocalyptic number.

It is an amenable number.

819428 is a deficient number, since it is larger than the sum of its proper divisors (614578).

819428 is a wasteful number, since it uses less digits than its factorization.

819428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204861 (or 204859 counting only the distinct ones).

The product of its digits is 4608, while the sum is 32.

The square root of 819428 is about 905.2226245516. Note that the first 3 decimals coincide. The cubic root of 819428 is about 93.5772474953.

The spelling of 819428 in words is "eight hundred nineteen thousand, four hundred twenty-eight".