189678257 has 2 divisors, whose sum is σ = 189678258. Its totient is φ = 189678256.

The previous prime is 189678227. The next prime is 189678271. The reversal of 189678257 is 752876981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127599616 + 62078641 = 11296^2 + 7879^2 .

It is a cyclic number.

It is not a de Polignac number, because 189678257 - 2⁶ = 189678193 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 189678199 and 189678208.

It is not a weakly prime, because it can be changed into another prime (189678227) 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, 94839128 + 94839129.

It is an arithmetic number, because the mean of its divisors is an integer number (94839129).

Almost surely, 2^189678257 is an apocalyptic number.

It is an amenable number.

189678257 is a deficient number, since it is larger than the sum of its proper divisors (1).

189678257 is an equidigital number, since it uses as much as digits as its factorization.

189678257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1693440, while the sum is 53.

The square root of 189678257 is about 13772.3729618392. The cubic root of 189678257 is about 574.5650215011.

The spelling of 189678257 in words is "one hundred eighty-nine million, six hundred seventy-eight thousand, two hundred fifty-seven".