9997775 has 6 divisors (see below), whose sum is σ = 12397272. Its totient is φ = 7998200.

The previous prime is 9997753. The next prime is 9997777. The reversal of 9997775 is 5777999.

It is not a de Polignac number, because 9997775 - 2⁶ = 9997711 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9997777) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 199931 + ... + 199980.

It is an arithmetic number, because the mean of its divisors is an integer number (2066212).

Almost surely, 2^9997775 is an apocalyptic number.

9997775 is a deficient number, since it is larger than the sum of its proper divisors (2399497).

9997775 is a wasteful number, since it uses less digits than its factorization.

9997775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399921 (or 399916 counting only the distinct ones).

The product of its digits is 1250235, while the sum is 53.

The square root of 9997775 is about 3161.9258372074. The cubic root of 9997775 is about 215.4274890940.

The spelling of 9997775 in words is "nine million, nine hundred ninety-seven thousand, seven hundred seventy-five".