9971440 has 20 divisors (see below), whose sum is σ = 23183784. Its totient is φ = 3988544.

The previous prime is 9971417. The next prime is 9971441. The reversal of 9971440 is 441799.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 9971396 and 9971405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9971441) 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, 62242 + ... + 62401.

Almost surely, 2^9971440 is an apocalyptic number.

It is an amenable number.

9971440 is an abundant number, since it is smaller than the sum of its proper divisors (13212344).

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

9971440 is a wasteful number, since it uses less digits than its factorization.

9971440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124656 (or 124650 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 9971440 is about 3157.7586988242. The cubic root of 9971440 is about 215.2381712530.

The spelling of 9971440 in words is "nine million, nine hundred seventy-one thousand, four hundred forty".