999985967 has 2 divisors, whose sum is σ = 999985968. Its totient is φ = 999985966.

The previous prime is 999985957. The next prime is 999985969. The reversal of 999985967 is 769589999.

It is a strong prime.

It is an emirp because it is prime and its reverse (769589999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999985967 - 2¹⁰ = 999984943 is a prime.

Together with 999985969, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999985967.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999985969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499992983 + 499992984.

It is an arithmetic number, because the mean of its divisors is an integer number (499992984).

Almost surely, 2^999985967 is an apocalyptic number.

999985967 is a deficient number, since it is larger than the sum of its proper divisors (1).

999985967 is an equidigital number, since it uses as much as digits as its factorization.

999985967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 99202320, while the sum is 71.

The square root of 999985967 is about 31622.5547196933. The cubic root of 999985967 is about 999.9953223115.

The spelling of 999985967 in words is "nine hundred ninety-nine million, nine hundred eighty-five thousand, nine hundred sixty-seven".