9981878 has 8 divisors (see below), whose sum is σ = 15760920. Its totient is φ = 4728240.

The previous prime is 9981869. The next prime is 9981889. The reversal of 9981878 is 8781899.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 131303 + ... + 131378.

It is an arithmetic number, because the mean of its divisors is an integer number (1970115).

Almost surely, 2^9981878 is an apocalyptic number.

9981878 is a deficient number, since it is larger than the sum of its proper divisors (5779042).

9981878 is a wasteful number, since it uses less digits than its factorization.

9981878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262702.

The product of its digits is 290304, while the sum is 50.

The square root of 9981878 is about 3159.4110210607. The cubic root of 9981878 is about 215.3132480912.

The spelling of 9981878 in words is "nine million, nine hundred eighty-one thousand, eight hundred seventy-eight".