1990000717 has 2 divisors, whose sum is σ = 1990000718.
Its totient is φ = 1990000716.
The previous prime is 1990000703. The next prime is 1990000759. The reversal of 1990000717 is 7170000991.
It is a happy number.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 1955496841 + 34503876 = 44221^2 + 5874^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-1990000717 is a prime.
1990000717 is a modest number, since divided by 717 gives 199 as remainder.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (1990000517) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995000358 + 995000359.
It is an arithmetic number, because the mean of its divisors is an integer number (995000359).
Almost surely, 21990000717 is an apocalyptic number.
It is an amenable number.
1990000717 is a deficient number, since it is larger than the sum of its proper divisors (1).
1990000717 is an equidigital number, since it uses as much as digits as its factorization.
1990000717 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 3969, while the sum is 34.
The square root of 1990000717 is about 44609.4240828101.
The cubic root of 1990000717 is about 1257.8178230081.
The spelling of 1990000717 in words is "one billion, nine hundred ninety million, seven hundred seventeen", and thus it is an aban number.