189847439 has 2 divisors, whose sum is σ = 189847440. Its totient is φ = 189847438.

The previous prime is 189847421. The next prime is 189847447. The reversal of 189847439 is 934748981.

It is a strong prime.

It is an emirp because it is prime and its reverse (934748981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189847439 - 2¹² = 189843343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189847409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94923719 + 94923720.

It is an arithmetic number, because the mean of its divisors is an integer number (94923720).

Almost surely, 2^189847439 is an apocalyptic number.

189847439 is a deficient number, since it is larger than the sum of its proper divisors (1).

189847439 is an equidigital number, since it uses as much as digits as its factorization.

189847439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 53.

The square root of 189847439 is about 13778.5136716556. The cubic root of 189847439 is about 574.7357969581.

The spelling of 189847439 in words is "one hundred eighty-nine million, eight hundred forty-seven thousand, four hundred thirty-nine".