9945771 has 24 divisors (see below), whose sum is σ = 14901696. Its totient is φ = 5851440.

The previous prime is 9945743. The next prime is 9945779. The reversal of 9945771 is 1775499.

It is a happy number.

It is not a de Polignac number, because 9945771 - 2⁶ = 9945707 is a prime.

9945771 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9945779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60936 + ... + 61098.

It is an arithmetic number, because the mean of its divisors is an integer number (620904).

Almost surely, 2^9945771 is an apocalyptic number.

9945771 is a deficient number, since it is larger than the sum of its proper divisors (4955925).

9945771 is a wasteful number, since it uses less digits than its factorization.

9945771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263 (or 220 counting only the distinct ones).

The product of its digits is 79380, while the sum is 42.

The square root of 9945771 is about 3153.6916463091. The cubic root of 9945771 is about 215.0533201088.

The spelling of 9945771 in words is "nine million, nine hundred forty-five thousand, seven hundred seventy-one".