995821 has 8 divisors (see below), whose sum is σ = 1028160. Its totient is φ = 964128.

The previous prime is 995801. The next prime is 995833. The reversal of 995821 is 128599.

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

It is a cyclic number.

It is not a de Polignac number, because 995821 - 2¹⁹ = 471533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (995801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5880 + ... + 6046.

It is an arithmetic number, because the mean of its divisors is an integer number (128520).

2⁹⁹⁵⁸²¹ is an apocalyptic number.

It is an amenable number.

995821 is a deficient number, since it is larger than the sum of its proper divisors (32339).

995821 is a wasteful number, since it uses less digits than its factorization.

995821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323.

The product of its digits is 6480, while the sum is 34.

The square root of 995821 is about 997.9083124215. The cubic root of 995821 is about 99.8605055033.

The spelling of 995821 in words is "nine hundred ninety-five thousand, eight hundred twenty-one".