9972817 has 4 divisors (see below), whose sum is σ = 9980260. Its totient is φ = 9965376.

The previous prime is 9972811. The next prime is 9972913. The reversal of 9972817 is 7182799.

It is a happy number.

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: 7182799 = 13 ⋅552523.

It can be written as a sum of positive squares in 2 ways, for example, as 4769856 + 5202961 = 2184^2 + 2281^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9972817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9972811) 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, 1092 + ... + 4597.

It is an arithmetic number, because the mean of its divisors is an integer number (2495065).

Almost surely, 2^9972817 is an apocalyptic number.

It is an amenable number.

9972817 is a deficient number, since it is larger than the sum of its proper divisors (7443).

9972817 is a wasteful number, since it uses less digits than its factorization.

9972817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7442.

The product of its digits is 63504, while the sum is 43.

The square root of 9972817 is about 3157.9767256900. The cubic root of 9972817 is about 215.2480785255.

The spelling of 9972817 in words is "nine million, nine hundred seventy-two thousand, eight hundred seventeen".