189667939 has 2 divisors, whose sum is σ = 189667940. Its totient is φ = 189667938.

The previous prime is 189667871. The next prime is 189667993. The reversal of 189667939 is 939766981.

189667939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (189667993) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 189667939 - 2²⁷ = 55450211 is a prime.

It is not a weakly prime, because it can be changed into another prime (189667999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94833969 + 94833970.

It is an arithmetic number, because the mean of its divisors is an integer number (94833970).

Almost surely, 2^189667939 is an apocalyptic number.

189667939 is a deficient number, since it is larger than the sum of its proper divisors (1).

189667939 is an equidigital number, since it uses as much as digits as its factorization.

189667939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4408992, while the sum is 58.

The square root of 189667939 is about 13771.9983662503. The cubic root of 189667939 is about 574.5546030352.

The spelling of 189667939 in words is "one hundred eighty-nine million, six hundred sixty-seven thousand, nine hundred thirty-nine".