189667993 has 2 divisors, whose sum is σ = 189667994. Its totient is φ = 189667992.

The previous prime is 189667939. The next prime is 189667999. The reversal of 189667993 is 399766981.

189667993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (189667939) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189667984 + 9 = 13772^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 189667993 - 2²⁵ = 156113561 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, 94833996 + 94833997.

It is an arithmetic number, because the mean of its divisors is an integer number (94833997).

Almost surely, 2^189667993 is an apocalyptic number.

It is an amenable number.

189667993 is a deficient number, since it is larger than the sum of its proper divisors (1).

189667993 is an equidigital number, since it uses as much as digits as its factorization.

189667993 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 189667993 is about 13772.0003267499. Note that the first 3 decimals coincide. The cubic root of 189667993 is about 574.5546575620.

The spelling of 189667993 in words is "one hundred eighty-nine million, six hundred sixty-seven thousand, nine hundred ninety-three".