187897 has 2 divisors, whose sum is σ = 187898. Its totient is φ = 187896.

The previous prime is 187883. The next prime is 187907. The reversal of 187897 is 798781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95481 + 92416 = 309^2 + 304^2 .

It is an emirp because it is prime and its reverse (798781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 187897 - 2¹¹ = 185849 is a prime.

It is a Chen prime.

187897 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (187877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93948 + 93949.

It is an arithmetic number, because the mean of its divisors is an integer number (93949).

2¹⁸⁷⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

187897 is a deficient number, since it is larger than the sum of its proper divisors (1).

187897 is an equidigital number, since it uses as much as digits as its factorization.

187897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 40.

The square root of 187897 is about 433.4708756076. The cubic root of 187897 is about 57.2760793445.

The spelling of 187897 in words is "one hundred eighty-seven thousand, eight hundred ninety-seven".