199984878 has 12 divisors (see below), whose sum is σ = 433300608. Its totient is φ = 66661620.

The previous prime is 199984877. The next prime is 199984891. The reversal of 199984878 is 878489991.

199984878 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199984871) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5555118 + ... + 5555153.

It is an arithmetic number, because the mean of its divisors is an integer number (36108384).

Almost surely, 2^199984878 is an apocalyptic number.

199984878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

199984878 is an abundant number, since it is smaller than the sum of its proper divisors (233315730).

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

199984878 is a wasteful number, since it uses less digits than its factorization.

199984878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11110279 (or 11110276 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 63.

The square root of 199984878 is about 14141.6009701872. The cubic root of 199984878 is about 584.7888082723.

The spelling of 199984878 in words is "one hundred ninety-nine million, nine hundred eighty-four thousand, eight hundred seventy-eight".