997867775 has 12 divisors (see below), whose sum is σ = 1237792800. Its totient is φ = 798012480.

The previous prime is 997867771. The next prime is 997867777. The reversal of 997867775 is 577768799.

It is not a de Polignac number, because 997867775 - 2² = 997867771 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997867771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 93146 + ... + 103304.

It is an arithmetic number, because the mean of its divisors is an integer number (103149400).

Almost surely, 2^997867775 is an apocalyptic number.

997867775 is a deficient number, since it is larger than the sum of its proper divisors (239925025).

997867775 is a wasteful number, since it uses less digits than its factorization.

997867775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14098 (or 14093 counting only the distinct ones).

The product of its digits is 46675440, while the sum is 65.

The square root of 997867775 is about 31589.0451739207. The cubic root of 997867775 is about 999.2887525804.

The spelling of 997867775 in words is "nine hundred ninety-seven million, eight hundred sixty-seven thousand, seven hundred seventy-five".