9971172 has 18 divisors (see below), whose sum is σ = 25204998. Its totient is φ = 3323712.

The previous prime is 9971161. The next prime is 9971173. The reversal of 9971172 is 2711799.

It can be written as a sum of positive squares in only one way, i.e., 9884736 + 86436 = 3144^2 + 294^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 276977 = 9971172 / (9 + 9 + 7 + 1 + 1 + 7 + 2).

It is not an unprimeable number, because it can be changed into a prime (9971173) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 138453 + ... + 138524.

Almost surely, 2^9971172 is an apocalyptic number.

It is an amenable number.

9971172 is an abundant number, since it is smaller than the sum of its proper divisors (15233826).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9971172 is a wasteful number, since it uses less digits than its factorization.

9971172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276987 (or 276982 counting only the distinct ones).

The product of its digits is 7938, while the sum is 36.

The square root of 9971172 is about 3157.7162633777. The cubic root of 9971172 is about 215.2362429342.

The spelling of 9971172 in words is "nine million, nine hundred seventy-one thousand, one hundred seventy-two".