999997967 has 2 divisors, whose sum is σ = 999997968. Its totient is φ = 999997966.

The previous prime is 999997891. The next prime is 999998003. The reversal of 999997967 is 769799999.

It is a strong prime.

It is an emirp because it is prime and its reverse (769799999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999997967 - 2²² = 995803663 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 999997894 and 999997903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999997067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499998983 + 499998984.

It is an arithmetic number, because the mean of its divisors is an integer number (499998984).

Almost surely, 2^999997967 is an apocalyptic number.

999997967 is a deficient number, since it is larger than the sum of its proper divisors (1).

999997967 is an equidigital number, since it uses as much as digits as its factorization.

999997967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 156243654, while the sum is 74.

The square root of 999997967 is about 31622.7444571150. The cubic root of 999997967 is about 999.9993223329. Note that the first 3 decimals are identical.

The spelling of 999997967 in words is "nine hundred ninety-nine million, nine hundred ninety-seven thousand, nine hundred sixty-seven".