190985987 has 2 divisors, whose sum is σ = 190985988. Its totient is φ = 190985986.

The previous prime is 190985969. The next prime is 190986023. The reversal of 190985987 is 789589091.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 190985987 - 2⁶ = 190985923 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (190985087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95492993 + 95492994.

It is an arithmetic number, because the mean of its divisors is an integer number (95492994).

Almost surely, 2^190985987 is an apocalyptic number.

190985987 is a deficient number, since it is larger than the sum of its proper divisors (1).

190985987 is an equidigital number, since it uses as much as digits as its factorization.

190985987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1632960, while the sum is 56.

The square root of 190985987 is about 13819.7679792390. The cubic root of 190985987 is about 575.8824378689.

The spelling of 190985987 in words is "one hundred ninety million, nine hundred eighty-five thousand, nine hundred eighty-seven".