189396139 has 2 divisors, whose sum is σ = 189396140. Its totient is φ = 189396138.

The previous prime is 189396131. The next prime is 189396157. The reversal of 189396139 is 931693981.

It is a weak prime.

It is an emirp because it is prime and its reverse (931693981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189396139 - 2³ = 189396131 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 189396092 and 189396101.

It is not a weakly prime, because it can be changed into another prime (189396131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94698069 + 94698070.

It is an arithmetic number, because the mean of its divisors is an integer number (94698070).

Almost surely, 2^189396139 is an apocalyptic number.

189396139 is a deficient number, since it is larger than the sum of its proper divisors (1).

189396139 is an equidigital number, since it uses as much as digits as its factorization.

189396139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 314928, while the sum is 49.

The square root of 189396139 is about 13762.1269795043. The cubic root of 189396139 is about 574.2800203491.

The spelling of 189396139 in words is "one hundred eighty-nine million, three hundred ninety-six thousand, one hundred thirty-nine".