9901878 has 32 divisors (see below), whose sum is σ = 22740480. Its totient is φ = 2815680.

The previous prime is 9901877. The next prime is 9901883. The reversal of 9901878 is 8781099.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9901877) 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 in 15 ways as a sum of consecutive naturals, for example, 11383 + ... + 12221.

It is an arithmetic number, because the mean of its divisors is an integer number (710640).

Almost surely, 2^9901878 is an apocalyptic number.

9901878 is an abundant number, since it is smaller than the sum of its proper divisors (12838602).

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

9901878 is a wasteful number, since it uses less digits than its factorization.

9901878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1132.

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 9901878 is about 3146.7249641492. The cubic root of 9901878 is about 214.7364934723.

The spelling of 9901878 in words is "nine million, nine hundred one thousand, eight hundred seventy-eight".