819953 has 4 divisors (see below), whose sum is σ = 822000. Its totient is φ = 817908.

The previous prime is 819943. The next prime is 819977. The reversal of 819953 is 359918.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 819953 - 2⁴ = 819937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (819913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203 + ... + 1296.

It is an arithmetic number, because the mean of its divisors is an integer number (205500).

2⁸¹⁹⁹⁵³ is an apocalyptic number.

It is an amenable number.

819953 is a deficient number, since it is larger than the sum of its proper divisors (2047).

819953 is a wasteful number, since it uses less digits than its factorization.

819953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2046.

The product of its digits is 9720, while the sum is 35.

The square root of 819953 is about 905.5125620332. The cubic root of 819953 is about 93.5972279234.

Subtracting from 819953 its sum of digits (35), we obtain a palindrome (819918).

The spelling of 819953 in words is "eight hundred nineteen thousand, nine hundred fifty-three".