9901816 has 8 divisors (see below), whose sum is σ = 18565920. Its totient is φ = 4950904.

The previous prime is 9901813. The next prime is 9901823. The reversal of 9901816 is 6181099.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9901813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 618856 + ... + 618871.

It is an arithmetic number, because the mean of its divisors is an integer number (2320740).

Almost surely, 2^9901816 is an apocalyptic number.

It is an amenable number.

9901816 is a deficient number, since it is larger than the sum of its proper divisors (8664104).

9901816 is a wasteful number, since it uses less digits than its factorization.

9901816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1237733 (or 1237729 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 9901816 is about 3146.7151126214. The cubic root of 9901816 is about 214.7360452850.

The spelling of 9901816 in words is "nine million, nine hundred one thousand, eight hundred sixteen".