9997919 has 4 divisors (see below), whose sum is σ = 10006896. Its totient is φ = 9988944.

The previous prime is 9997913. The next prime is 9997927. The reversal of 9997919 is 9197999.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9197999 = 23 ⋅399913.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9997919 is a prime.

It is a super-2 number, since 2×9997919² = 199916768661122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9997913) 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 3 ways as a sum of consecutive naturals, for example, 2534 + ... + 5139.

It is an arithmetic number, because the mean of its divisors is an integer number (2501724).

Almost surely, 2^9997919 is an apocalyptic number.

9997919 is a deficient number, since it is larger than the sum of its proper divisors (8977).

9997919 is a wasteful number, since it uses less digits than its factorization.

9997919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8976.

The product of its digits is 413343, while the sum is 53.

The square root of 9997919 is about 3161.9486080580. The cubic root of 9997919 is about 215.4285233711.

The spelling of 9997919 in words is "nine million, nine hundred ninety-seven thousand, nine hundred nineteen".