189938087 has 2 divisors, whose sum is σ = 189938088. Its totient is φ = 189938086.

The previous prime is 189938039. The next prime is 189938143. The reversal of 189938087 is 780839981.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189938087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189938387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94969043 + 94969044.

It is an arithmetic number, because the mean of its divisors is an integer number (94969044).

Almost surely, 2^189938087 is an apocalyptic number.

189938087 is a deficient number, since it is larger than the sum of its proper divisors (1).

189938087 is an equidigital number, since it uses as much as digits as its factorization.

189938087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 53.

The square root of 189938087 is about 13781.8027485522. The cubic root of 189938087 is about 574.8272569940.

The spelling of 189938087 in words is "one hundred eighty-nine million, nine hundred thirty-eight thousand, eighty-seven".