9945621 has 12 divisors (see below), whose sum is σ = 16418272. Its totient is φ = 5683176.

The previous prime is 9945619. The next prime is 9945631. The reversal of 9945621 is 1265499.

9945621 is a `hidden beast` number, since 9 + 94 + 562 + 1 = 666.

It is not a de Polignac number, because 9945621 - 2¹ = 9945619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9945631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78871 + ... + 78996.

Almost surely, 2^9945621 is an apocalyptic number.

It is an amenable number.

9945621 is a deficient number, since it is larger than the sum of its proper divisors (6472651).

9945621 is a wasteful number, since it uses less digits than its factorization.

9945621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157880 (or 157877 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 9945621 is about 3153.6678645666. The cubic root of 9945621 is about 215.0522389739.

The spelling of 9945621 in words is "nine million, nine hundred forty-five thousand, six hundred twenty-one".