190511993 has 16 divisors (see below), whose sum is σ = 231429120. Its totient is φ = 153188496.

The previous prime is 190511989. The next prime is 190512017. The reversal of 190511993 is 399115091.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 190511993 - 2² = 190511989 is a prime.

It is not an unprimeable number, because it can be changed into a prime (190511393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6746 + ... + 20652.

It is an arithmetic number, because the mean of its divisors is an integer number (14464320).

Almost surely, 2^190511993 is an apocalyptic number.

It is an amenable number.

190511993 is a deficient number, since it is larger than the sum of its proper divisors (40917127).

190511993 is a wasteful number, since it uses less digits than its factorization.

190511993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14036.

The product of its (nonzero) digits is 10935, while the sum is 38.

The square root of 190511993 is about 13802.6081955549. The cubic root of 190511993 is about 575.4056298519.

The spelling of 190511993 in words is "one hundred ninety million, five hundred eleven thousand, nine hundred ninety-three".