995989 has 2 divisors, whose sum is σ = 995990. Its totient is φ = 995988.

The previous prime is 995987. The next prime is 996001. The reversal of 995989 is 989599.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 656100 + 339889 = 810^2 + 583^2 .

It is a cyclic number.

It is not a de Polignac number, because 995989 - 2¹ = 995987 is a prime.

Together with 995987, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (995983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497994 + 497995.

It is an arithmetic number, because the mean of its divisors is an integer number (497995).

2⁹⁹⁵⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

995989 is a deficient number, since it is larger than the sum of its proper divisors (1).

995989 is an equidigital number, since it uses as much as digits as its factorization.

995989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 262440, while the sum is 49.

The square root of 995989 is about 997.9924849416. The cubic root of 995989 is about 99.8661208437.

The spelling of 995989 in words is "nine hundred ninety-five thousand, nine hundred eighty-nine".