999997673 has 2 divisors, whose sum is σ = 999997674. Its totient is φ = 999997672.

The previous prime is 999997643. The next prime is 999997679. The reversal of 999997673 is 376799999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 577777369 + 422220304 = 24037^2 + 20548^2 .

It is a cyclic number.

It is not a de Polignac number, because 999997673 - 2¹⁰ = 999996649 is a prime.

It is not a weakly prime, because it can be changed into another prime (999997679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499998836 + 499998837.

It is an arithmetic number, because the mean of its divisors is an integer number (499998837).

Almost surely, 2^999997673 is an apocalyptic number.

It is an amenable number.

999997673 is a deficient number, since it is larger than the sum of its proper divisors (1).

999997673 is an equidigital number, since it uses as much as digits as its factorization.

999997673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52081218, while the sum is 68.

The square root of 999997673 is about 31622.7398085618. The cubic root of 999997673 is about 999.9992243327. Note that the first 3 decimals are identical.

The spelling of 999997673 in words is "nine hundred ninety-nine million, nine hundred ninety-seven thousand, six hundred seventy-three".