194981878 has 48 divisors (see below), whose sum is σ = 378290304. Its totient is φ = 74632320.

The previous prime is 194981867. The next prime is 194981881. The reversal of 194981878 is 878189491.

194981878 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

194981878 is a nontrivial binomial coefficient, being equal to C(19748, 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37026 + ... + 41962.

It is an arithmetic number, because the mean of its divisors is an integer number (7881048).

Almost surely, 2^194981878 is an apocalyptic number.

194981878 is the 19747-th triangular number and also the 9874-th hexagonal number.

194981878 is the 6583-rd centered nonagonal number.

194981878 is a deficient number, since it is larger than the sum of its proper divisors (183308426).

194981878 is a wasteful number, since it uses less digits than its factorization.

194981878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4997 (or 4990 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 55.

The square root of 194981878 is about 13963.5911570054. The cubic root of 194981878 is about 579.8710355358.

The spelling of 194981878 in words is "one hundred ninety-four million, nine hundred eighty-one thousand, eight hundred seventy-eight".