189477973 has 2 divisors, whose sum is σ = 189477974. Its totient is φ = 189477972.

The previous prime is 189477947. The next prime is 189477991. The reversal of 189477973 is 379774981.

189477973 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., 185449924 + 4028049 = 13618^2 + 2007^2 .

It is a cyclic number.

It is not a de Polignac number, because 189477973 - 2⁵ = 189477941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189477923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94738986 + 94738987.

It is an arithmetic number, because the mean of its divisors is an integer number (94738987).

Almost surely, 2^189477973 is an apocalyptic number.

It is an amenable number.

189477973 is a deficient number, since it is larger than the sum of its proper divisors (1).

189477973 is an equidigital number, since it uses as much as digits as its factorization.

189477973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2667168, while the sum is 55.

The square root of 189477973 is about 13765.0998180180. The cubic root of 189477973 is about 574.3627197896.

The spelling of 189477973 in words is "one hundred eighty-nine million, four hundred seventy-seven thousand, nine hundred seventy-three".