189977 has 2 divisors, whose sum is σ = 189978. Its totient is φ = 189976.

The previous prime is 189967. The next prime is 189983. The reversal of 189977 is 779981.

189977 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179776 + 10201 = 424^2 + 101^2 .

It is an emirp because it is prime and its reverse (779981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189977 - 2⁴ = 189961 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (189947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94988 + 94989.

It is an arithmetic number, because the mean of its divisors is an integer number (94989).

2¹⁸⁹⁹⁷⁷ is an apocalyptic number.

It is an amenable number.

189977 is a deficient number, since it is larger than the sum of its proper divisors (1).

189977 is an equidigital number, since it uses as much as digits as its factorization.

189977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 41.

The square root of 189977 is about 435.8635107462. The cubic root of 189977 is about 57.4866509654.

The spelling of 189977 in words is "one hundred eighty-nine thousand, nine hundred seventy-seven".