842819 has 2 divisors, whose sum is σ = 842820. Its totient is φ = 842818.

The previous prime is 842813. The next prime is 842857. The reversal of 842819 is 918248.

It is a happy number.

842819 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-842819 is a prime.

It is a super-2 number, since 2×842819² = 1420687733522, which contains 22 as substring.

It is a plaindrome in base 12 and base 15.

It is not a weakly prime, because it can be changed into another prime (842813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421409 + 421410.

It is an arithmetic number, because the mean of its divisors is an integer number (421410).

2⁸⁴²⁸¹⁹ is an apocalyptic number.

842819 is a deficient number, since it is larger than the sum of its proper divisors (1).

842819 is an equidigital number, since it uses as much as digits as its factorization.

842819 is an evil number, because the sum of its binary digits is even.

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

The square root of 842819 is about 918.0517414612. The cubic root of 842819 is about 94.4593107958.

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

The spelling of 842819 in words is "eight hundred forty-two thousand, eight hundred nineteen".