9945072 has 40 divisors (see below), whose sum is σ = 28547280. Its totient is φ = 3314880.

The previous prime is 9945071. The next prime is 9945077. The reversal of 9945072 is 2705499.

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 (9945071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11079 + ... + 11942.

It is an arithmetic number, because the mean of its divisors is an integer number (713682).

Almost surely, 2^9945072 is an apocalyptic number.

It is an amenable number.

9945072 is an abundant number, since it is smaller than the sum of its proper divisors (18602208).

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

9945072 is a wasteful number, since it uses less digits than its factorization.

9945072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23038 (or 23026 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 9945072 is about 3153.5808218595. The cubic root of 9945072 is about 215.0482819275.

The spelling of 9945072 in words is "nine million, nine hundred forty-five thousand, seventy-two".