199171930 has 16 divisors (see below), whose sum is σ = 358919424. Its totient is φ = 79577680.

The previous prime is 199171909. The next prime is 199171937. The reversal of 199171930 is 39171991.

It is not an unprimeable number, because it can be changed into a prime (199171937) 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 7 ways as a sum of consecutive naturals, for example, 1822 + ... + 20041.

It is an arithmetic number, because the mean of its divisors is an integer number (22432464).

Almost surely, 2^199171930 is an apocalyptic number.

199171930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199171930 is a deficient number, since it is larger than the sum of its proper divisors (159747494).

199171930 is a wasteful number, since it uses less digits than its factorization.

199171930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22781.

The product of its (nonzero) digits is 15309, while the sum is 40.

The square root of 199171930 is about 14112.8285612771. The cubic root of 199171930 is about 583.9953340623.

The spelling of 199171930 in words is "one hundred ninety-nine million, one hundred seventy-one thousand, nine hundred thirty".