9901642 has 16 divisors (see below), whose sum is σ = 15202152. Its totient is φ = 4835520.

The previous prime is 9901637. The next prime is 9901649. The reversal of 9901642 is 2461099.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6765201 + 3136441 = 2601^2 + 1771^2 .

It is not an unprimeable number, because it can be changed into a prime (9901649) 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 7 ways as a sum of consecutive naturals, for example, 33648 + ... + 33940.

Almost surely, 2^9901642 is an apocalyptic number.

9901642 is a deficient number, since it is larger than the sum of its proper divisors (5300510).

9901642 is a wasteful number, since it uses less digits than its factorization.

9901642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 9901642 is about 3146.6874646205. The cubic root of 9901642 is about 214.7347874588.

The spelling of 9901642 in words is "nine million, nine hundred one thousand, six hundred forty-two".