9906945 has 16 divisors (see below), whose sum is σ = 15904512. Its totient is φ = 5265920.

The previous prime is 9906943. The next prime is 9906973. The reversal of 9906945 is 5496099.

It is a happy number.

It is not a de Polignac number, because 9906945 - 2¹ = 9906943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9906897 and 9906906.

It is not an unprimeable number, because it can be changed into a prime (9906943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4360 + ... + 6230.

It is an arithmetic number, because the mean of its divisors is an integer number (994032).

Almost surely, 2^9906945 is an apocalyptic number.

It is an amenable number.

9906945 is a deficient number, since it is larger than the sum of its proper divisors (5997567).

9906945 is a wasteful number, since it uses less digits than its factorization.

9906945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2232.

The product of its (nonzero) digits is 87480, while the sum is 42.

The square root of 9906945 is about 3147.5299839716. The cubic root of 9906945 is about 214.7731156252.

The spelling of 9906945 in words is "nine million, nine hundred six thousand, nine hundred forty-five".