819642 has 8 divisors (see below), whose sum is σ = 1639296. Its totient is φ = 273212.

The previous prime is 819629. The next prime is 819647. The reversal of 819642 is 246918.

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

819642 is an admirable number.

It is a d-powerful number, because it can be written as 8 + 1 + 6⁷ + 9⁶ + 4³ + 2¹³ .

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (819647) by changing a digit.

819642 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, 68298 + ... + 68309.

It is an arithmetic number, because the mean of its divisors is an integer number (204912).

2⁸¹⁹⁶⁴² is an apocalyptic number.

819642 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

819642 is a wasteful number, since it uses less digits than its factorization.

819642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136612.

The product of its digits is 3456, while the sum is 30.

The square root of 819642 is about 905.3408198021. The cubic root of 819642 is about 93.5853929284.

The spelling of 819642 in words is "eight hundred nineteen thousand, six hundred forty-two".