9999878 has 16 divisors (see below), whose sum is σ = 17302560. Its totient is φ = 4245696.

The previous prime is 9999877. The next prime is 9999883. The reversal of 9999878 is 8789999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999877) 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, 1751 + ... + 4802.

It is an arithmetic number, because the mean of its divisors is an integer number (1081410).

Almost surely, 2^9999878 is an apocalyptic number.

9999878 is a deficient number, since it is larger than the sum of its proper divisors (7302682).

9999878 is a wasteful number, since it uses less digits than its factorization.

9999878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6671.

The product of its digits is 2939328, while the sum is 59.

The square root of 9999878 is about 3162.2583702158. The cubic root of 9999878 is about 215.4425928629.

The spelling of 9999878 in words is "nine million, nine hundred ninety-nine thousand, eight hundred seventy-eight".