194972866 has 16 divisors (see below), whose sum is σ = 321687648. Its totient is φ = 88622820.

The previous prime is 194972839. The next prime is 194972867. The reversal of 194972866 is 668279491.

It is a happy number.

194972866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (194972867) 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, 33960 + ... + 39283.

It is an arithmetic number, because the mean of its divisors is an integer number (20105478).

Almost surely, 2^194972866 is an apocalyptic number.

194972866 is a deficient number, since it is larger than the sum of its proper divisors (126714782).

194972866 is an equidigital number, since it uses as much as digits as its factorization.

194972866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73278 (or 73256 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 52.

The square root of 194972866 is about 13963.2684569194. The cubic root of 194972866 is about 579.8621015803.

The spelling of 194972866 in words is "one hundred ninety-four million, nine hundred seventy-two thousand, eight hundred sixty-six".