9117972 has 36 divisors (see below), whose sum is σ = 23281440. Its totient is φ = 3008592.

The previous prime is 9117971. The next prime is 9117973. The reversal of 9117972 is 2797119.

It is an interprime number because it is at equal distance from previous prime (9117971) and next prime (9117973).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9117971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2479 + ... + 4937.

Almost surely, 2^9117972 is an apocalyptic number.

It is an amenable number.

9117972 is an abundant number, since it is smaller than the sum of its proper divisors (14163468).

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

9117972 is a wasteful number, since it uses less digits than its factorization.

9117972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2572 (or 2567 counting only the distinct ones).

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

The square root of 9117972 is about 3019.5979864876. The cubic root of 9117972 is about 208.9132978284.

The spelling of 9117972 in words is "nine million, one hundred seventeen thousand, nine hundred seventy-two".