189478057 has 2 divisors, whose sum is σ = 189478058. Its totient is φ = 189478056.

The previous prime is 189478043. The next prime is 189478067. The reversal of 189478057 is 750874981.

189478057 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., 132158016 + 57320041 = 11496^2 + 7571^2 .

It is an emirp because it is prime and its reverse (750874981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189478057 - 2⁷ = 189477929 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 189478057.

It is not a weakly prime, because it can be changed into another prime (189478067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94739028 + 94739029.

It is an arithmetic number, because the mean of its divisors is an integer number (94739029).

Almost surely, 2^189478057 is an apocalyptic number.

It is an amenable number.

189478057 is a deficient number, since it is larger than the sum of its proper divisors (1).

189478057 is an equidigital number, since it uses as much as digits as its factorization.

189478057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 564480, while the sum is 49.

The square root of 189478057 is about 13765.1028692124. The cubic root of 189478057 is about 574.3628046658.

The spelling of 189478057 in words is "one hundred eighty-nine million, four hundred seventy-eight thousand, fifty-seven".