819853 has 2 divisors, whose sum is σ = 819854. Its totient is φ = 819852.

The previous prime is 819829. The next prime is 819899. The reversal of 819853 is 358918.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 708964 + 110889 = 842^2 + 333^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-819853 is a prime.

819853 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (819823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409926 + 409927.

It is an arithmetic number, because the mean of its divisors is an integer number (409927).

2⁸¹⁹⁸⁵³ is an apocalyptic number.

It is an amenable number.

819853 is a deficient number, since it is larger than the sum of its proper divisors (1).

819853 is an equidigital number, since it uses as much as digits as its factorization.

819853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 34.

The square root of 819853 is about 905.4573430041. The cubic root of 819853 is about 93.5934227852.

The spelling of 819853 in words is "eight hundred nineteen thousand, eight hundred fifty-three".