9906642 has 12 divisors (see below), whose sum is σ = 21464430. Its totient is φ = 3302208.

The previous prime is 9906599. The next prime is 9906653. The reversal of 9906642 is 2466099.

9906642 is a `hidden beast` number, since 9 + 9 + 0 + 6 + 642 = 666.

9906642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 8415801 + 1490841 = 2901^2 + 1221^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 9906597 and 9906606.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 275167 + ... + 275202.

Almost surely, 2^9906642 is an apocalyptic number.

9906642 is an abundant number, since it is smaller than the sum of its proper divisors (11557788).

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

9906642 is a wasteful number, since it uses less digits than its factorization.

9906642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550377 (or 550374 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 9906642 is about 3147.4818506228. The cubic root of 9906642 is about 214.7709260192.

The spelling of 9906642 in words is "nine million, nine hundred six thousand, six hundred forty-two".