187942897 has 2 divisors, whose sum is σ = 187942898. Its totient is φ = 187942896.

The previous prime is 187942883. The next prime is 187942901. The reversal of 187942897 is 798249781.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126540001 + 61402896 = 11249^2 + 7836^2 .

It is a cyclic number.

It is not a de Polignac number, because 187942897 - 2¹¹ = 187940849 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (187942877) 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 as a sum of consecutive naturals, namely, 93971448 + 93971449.

It is an arithmetic number, because the mean of its divisors is an integer number (93971449).

Almost surely, 2^187942897 is an apocalyptic number.

It is an amenable number.

187942897 is a deficient number, since it is larger than the sum of its proper divisors (1).

187942897 is an equidigital number, since it uses as much as digits as its factorization.

187942897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2032128, while the sum is 55.

The square root of 187942897 is about 13709.2267105041. The cubic root of 187942897 is about 572.8074251314.

The spelling of 187942897 in words is "one hundred eighty-seven million, nine hundred forty-two thousand, eight hundred ninety-seven".