819995 has 16 divisors (see below), whose sum is σ = 1137888. Its totient is φ = 560640.

The previous prime is 819991. The next prime is 820037. The reversal of 819995 is 599918.

It is not a de Polignac number, because 819995 - 2² = 819991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (819991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 497 + ... + 1373.

It is an arithmetic number, because the mean of its divisors is an integer number (71118).

2⁸¹⁹⁹⁹⁵ is an apocalyptic number.

819995 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

819995 is a deficient number, since it is larger than the sum of its proper divisors (317893).

819995 is a wasteful number, since it uses less digits than its factorization.

819995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910.

The product of its digits is 29160, while the sum is 41.

The square root of 819995 is about 905.5357530214. The cubic root of 819995 is about 93.5988259891.

The spelling of 819995 in words is "eight hundred nineteen thousand, nine hundred ninety-five".