9945447 has 8 divisors (see below), whose sum is σ = 13442544. Its totient is φ = 6539328.

The previous prime is 9945443. The next prime is 9945449. The reversal of 9945447 is 7445499.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9945447 - 2² = 9945443 is a prime.

9945447 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 9945399 and 9945408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9945443) 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 7 ways as a sum of consecutive naturals, for example, 22488 + ... + 22925.

It is an arithmetic number, because the mean of its divisors is an integer number (1680318).

Almost surely, 2^9945447 is an apocalyptic number.

9945447 is a deficient number, since it is larger than the sum of its proper divisors (3497097).

9945447 is a wasteful number, since it uses less digits than its factorization.

9945447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45489.

The product of its digits is 181440, while the sum is 42.

The square root of 9945447 is about 3153.6402775206. The cubic root of 9945447 is about 215.0509848438.

It can be divided in two parts, 994 and 5447, that added together give a triangular number (6441 = T₁₁₃).

The spelling of 9945447 in words is "nine million, nine hundred forty-five thousand, four hundred forty-seven".