190985999 has 4 divisors (see below), whose sum is σ = 192840336. Its totient is φ = 189131664.

The previous prime is 190985987. The next prime is 190986023. The reversal of 190985999 is 999589091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999589091 = 47 ⋅21267853.

It is a cyclic number.

It is not a de Polignac number, because 190985999 - 2¹⁶ = 190920463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190985969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 927014 + ... + 927219.

It is an arithmetic number, because the mean of its divisors is an integer number (48210084).

Almost surely, 2^190985999 is an apocalyptic number.

190985999 is a deficient number, since it is larger than the sum of its proper divisors (1854337).

190985999 is a wasteful number, since it uses less digits than its factorization.

190985999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1854336.

The product of its (nonzero) digits is 2361960, while the sum is 59.

The square root of 190985999 is about 13819.7684133997. The cubic root of 190985999 is about 575.8824499302.

The spelling of 190985999 in words is "one hundred ninety million, nine hundred eighty-five thousand, nine hundred ninety-nine".