9987878 has 8 divisors (see below), whose sum is σ = 15016968. Its totient is φ = 4982224.

The previous prime is 9987877. The next prime is 9987881. The reversal of 9987878 is 8787899.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9987877) 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 3 ways as a sum of consecutive naturals, for example, 4751 + ... + 6522.

It is an arithmetic number, because the mean of its divisors is an integer number (1877121).

Almost surely, 2^9987878 is an apocalyptic number.

9987878 is a deficient number, since it is larger than the sum of its proper divisors (5029090).

9987878 is a wasteful number, since it uses less digits than its factorization.

9987878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11718.

The product of its digits is 2032128, while the sum is 56.

The square root of 9987878 is about 3160.3604224835. The cubic root of 9987878 is about 215.3563802797.

The spelling of 9987878 in words is "nine million, nine hundred eighty-seven thousand, eight hundred seventy-eight".