985819 has 2 divisors, whose sum is σ = 985820. Its totient is φ = 985818.

The previous prime is 985807. The next prime is 985867. The reversal of 985819 is 918589.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 985819 - 2⁹ = 985307 is a prime.

It is a super-2 number, since 2×985819² = 1943678201522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (985219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492909 + 492910.

It is an arithmetic number, because the mean of its divisors is an integer number (492910).

2⁹⁸⁵⁸¹⁹ is an apocalyptic number.

985819 is a deficient number, since it is larger than the sum of its proper divisors (1).

985819 is an equidigital number, since it uses as much as digits as its factorization.

985819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 40.

The square root of 985819 is about 992.8841825712. The cubic root of 985819 is about 99.5250477752.

The spelling of 985819 in words is "nine hundred eighty-five thousand, eight hundred nineteen".