191930 has 16 divisors (see below), whose sum is σ = 366120. Its totient is φ = 72192.

The previous prime is 191929. The next prime is 191953. The reversal of 191930 is 39191.

191930 = T₆₀ + T₆₁ + ... + T₁₁₀.

191930 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 137641 + 54289 = 371^2 + 233^2 .

It is a junction number, because it is equal to n+sod(n) for n = 191896 and 191905.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395 + ... + 734.

2¹⁹¹⁹³⁰ is an apocalyptic number.

191930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

191930 is a deficient number, since it is larger than the sum of its proper divisors (174190).

191930 is a wasteful number, since it uses less digits than its factorization.

191930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153.

The product of its (nonzero) digits is 243, while the sum is 23.

The square root of 191930 is about 438.0981625161. The cubic root of 191930 is about 57.6829710247.

The spelling of 191930 in words is "one hundred ninety-one thousand, nine hundred thirty".