189288739 has 2 divisors, whose sum is σ = 189288740. Its totient is φ = 189288738.

The previous prime is 189288731. The next prime is 189288751. The reversal of 189288739 is 937882981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 189288739 - 2³ = 189288731 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 189288739.

It is not a weakly prime, because it can be changed into another prime (189288731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94644369 + 94644370.

It is an arithmetic number, because the mean of its divisors is an integer number (94644370).

Almost surely, 2^189288739 is an apocalyptic number.

189288739 is a deficient number, since it is larger than the sum of its proper divisors (1).

189288739 is an equidigital number, since it uses as much as digits as its factorization.

189288739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 55.

The square root of 189288739 is about 13758.2244130556. The cubic root of 189288739 is about 574.1714483782.

The spelling of 189288739 in words is "one hundred eighty-nine million, two hundred eighty-eight thousand, seven hundred thirty-nine".