9997805 has 4 divisors (see below), whose sum is σ = 11997372. Its totient is φ = 7998240.

The previous prime is 9997787. The next prime is 9997817. The reversal of 9997805 is 5087999.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2669956 + 7327849 = 1634^2 + 2707^2 .

It is not a de Polignac number, because 9997805 - 2¹⁰ = 9996781 is a prime.

It is a super-2 number, since 2×9997805² = 199912209636050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9997805.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 999776 + ... + 999785.

It is an arithmetic number, because the mean of its divisors is an integer number (2999343).

Almost surely, 2^9997805 is an apocalyptic number.

It is an amenable number.

9997805 is a deficient number, since it is larger than the sum of its proper divisors (1999567).

9997805 is a wasteful number, since it uses less digits than its factorization.

9997805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1999566.

The product of its (nonzero) digits is 204120, while the sum is 47.

The square root of 9997805 is about 3161.9305811482. The cubic root of 9997805 is about 215.4277045692.

The spelling of 9997805 in words is "nine million, nine hundred ninety-seven thousand, eight hundred five".