9945723440 has 20 divisors (see below), whose sum is σ = 23123807184. Its totient is φ = 3978289344.

The previous prime is 9945723433. The next prime is 9945723481. The reversal of 9945723440 is 443275499.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62160692 + ... + 62160851.

Almost surely, 2^9945723440 is an apocalyptic number.

It is an amenable number.

9945723440 is an abundant number, since it is smaller than the sum of its proper divisors (13178083744).

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

9945723440 is a wasteful number, since it uses less digits than its factorization.

9945723440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124321556 (or 124321550 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 47.

The square root of 9945723440 is about 99728.2479541278. The cubic root of 9945723440 is about 2150.5297731817.

The spelling of 9945723440 in words is "nine billion, nine hundred forty-five million, seven hundred twenty-three thousand, four hundred forty".