189778671 has 12 divisors (see below), whose sum is σ = 274538472. Its totient is φ = 126328176.

The previous prime is 189778663. The next prime is 189778691. The reversal of 189778671 is 176877981.

It is not a de Polignac number, because 189778671 - 2³ = 189778663 is a prime.

It is a super-3 number, since 3×189778671³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189778601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9481 + ... + 21666.

It is an arithmetic number, because the mean of its divisors is an integer number (22878206).

Almost surely, 2^189778671 is an apocalyptic number.

189778671 is a deficient number, since it is larger than the sum of its proper divisors (84759801).

189778671 is a wasteful number, since it uses less digits than its factorization.

189778671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31830 (or 31827 counting only the distinct ones).

The product of its digits is 1185408, while the sum is 54.

The square root of 189778671 is about 13776.0179660162. The cubic root of 189778671 is about 574.6663935034. Note that the first 3 decimals are identical.

The spelling of 189778671 in words is "one hundred eighty-nine million, seven hundred seventy-eight thousand, six hundred seventy-one".