9997823 has 4 divisors (see below), whose sum is σ = 10906728. Its totient is φ = 9088920.

The previous prime is 9997817. The next prime is 9997829. The reversal of 9997823 is 3287999.

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

It is an interprime number because it is at equal distance from previous prime (9997817) and next prime (9997829).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9997823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9997829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454436 + ... + 454457.

It is an arithmetic number, because the mean of its divisors is an integer number (2726682).

Almost surely, 2^9997823 is an apocalyptic number.

9997823 is a deficient number, since it is larger than the sum of its proper divisors (908905).

9997823 is a wasteful number, since it uses less digits than its factorization.

9997823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908904.

The product of its digits is 244944, while the sum is 47.

The square root of 9997823 is about 3161.9334275092. The cubic root of 9997823 is about 215.4278338541.

It can be divided in two parts, 99978 and 23, that added together give a palindrome (100001).

The spelling of 9997823 in words is "nine million, nine hundred ninety-seven thousand, eight hundred twenty-three".