189786977 has 4 divisors (see below), whose sum is σ = 189844116. Its totient is φ = 189729840.

The previous prime is 189786967. The next prime is 189787001. The reversal of 189786977 is 779687981.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 132618256 + 57168721 = 11516^2 + 7561^2 .

It is a cyclic number.

It is not a de Polignac number, because 189786977 - 2⁶ = 189786913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189786937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23258 + ... + 30339.

It is an arithmetic number, because the mean of its divisors is an integer number (47461029).

Almost surely, 2^189786977 is an apocalyptic number.

It is an amenable number.

189786977 is a deficient number, since it is larger than the sum of its proper divisors (57139).

189786977 is an equidigital number, since it uses as much as digits as its factorization.

189786977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57138.

The product of its digits is 10668672, while the sum is 62.

The square root of 189786977 is about 13776.3194286428. The cubic root of 189786977 is about 574.6747771456.

The spelling of 189786977 in words is "one hundred eighty-nine million, seven hundred eighty-six thousand, nine hundred seventy-seven".