189639841 has 2 divisors, whose sum is σ = 189639842. Its totient is φ = 189639840.

The previous prime is 189639799. The next prime is 189639859. The reversal of 189639841 is 148936981.

189639841 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., 123298816 + 66341025 = 11104^2 + 8145^2 .

It is a cyclic number.

It is not a de Polignac number, because 189639841 - 2¹¹ = 189637793 is a prime.

It is not a weakly prime, because it can be changed into another prime (189639881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94819920 + 94819921.

It is an arithmetic number, because the mean of its divisors is an integer number (94819921).

Almost surely, 2^189639841 is an apocalyptic number.

It is an amenable number.

189639841 is a deficient number, since it is larger than the sum of its proper divisors (1).

189639841 is an equidigital number, since it uses as much as digits as its factorization.

189639841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 49.

The square root of 189639841 is about 13770.9782150724. The cubic root of 189639841 is about 574.5262295304.

The spelling of 189639841 in words is "one hundred eighty-nine million, six hundred thirty-nine thousand, eight hundred forty-one".