189967087 has 2 divisors, whose sum is σ = 189967088. Its totient is φ = 189967086.

The previous prime is 189967049. The next prime is 189967093. The reversal of 189967087 is 780769981.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189967087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189967007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94983543 + 94983544.

It is an arithmetic number, because the mean of its divisors is an integer number (94983544).

Almost surely, 2^189967087 is an apocalyptic number.

189967087 is a deficient number, since it is larger than the sum of its proper divisors (1).

189967087 is an equidigital number, since it uses as much as digits as its factorization.

189967087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1524096, while the sum is 55.

The square root of 189967087 is about 13782.8548203919. The cubic root of 189967087 is about 574.8565106355.

It can be divided in two parts, 1899 and 67087, that added together give a palindrome (68986).

The spelling of 189967087 in words is "one hundred eighty-nine million, nine hundred sixty-seven thousand, eighty-seven".