819842 has 8 divisors (see below), whose sum is σ = 1302156. Its totient is φ = 385792.

The previous prime is 819829. The next prime is 819853. The reversal of 819842 is 248918.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 776161 + 43681 = 881^2 + 209^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 819799 and 819808.

It is an unprimeable number.

819842 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12023 + ... + 12090.

2⁸¹⁹⁸⁴² is an apocalyptic number.

819842 is a deficient number, since it is larger than the sum of its proper divisors (482314).

819842 is a wasteful number, since it uses less digits than its factorization.

819842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24132.

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

The square root of 819842 is about 905.4512687053. The cubic root of 819842 is about 93.5930042011.

It can be divided in two parts, 819 and 842, that added together give a palindrome (1661).

The spelling of 819842 in words is "eight hundred nineteen thousand, eight hundred forty-two".