9901640 has 32 divisors (see below), whose sum is σ = 25462080. Its totient is φ = 3394752.

The previous prime is 9901637. The next prime is 9901649. The reversal of 9901640 is 461099.

It is not an unprimeable number, because it can be changed into a prime (9901649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17402 + ... + 17961.

It is an arithmetic number, because the mean of its divisors is an integer number (795690).

Almost surely, 2^9901640 is an apocalyptic number.

It is an amenable number.

9901640 is an abundant number, since it is smaller than the sum of its proper divisors (15560440).

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

9901640 is a wasteful number, since it uses less digits than its factorization.

9901640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35381 (or 35377 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 9901640 is about 3146.6871468260. The cubic root of 9901640 is about 214.7347730009.

The spelling of 9901640 in words is "nine million, nine hundred one thousand, six hundred forty".