199951930 has 16 divisors (see below), whose sum is σ = 361246464. Its totient is φ = 79684560.

The previous prime is 199951907. The next prime is 199951931. The reversal of 199951930 is 39159991.

It is not an unprimeable number, because it can be changed into a prime (199951931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34182 + ... + 39601.

It is an arithmetic number, because the mean of its divisors is an integer number (22577904).

Almost surely, 2^199951930 is an apocalyptic number.

199951930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199951930 is a deficient number, since it is larger than the sum of its proper divisors (161294534).

199951930 is a wasteful number, since it uses less digits than its factorization.

199951930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74061.

The product of its (nonzero) digits is 98415, while the sum is 46.

The square root of 199951930 is about 14140.4359904495. The cubic root of 199951930 is about 584.7566913775.

The spelling of 199951930 in words is "one hundred ninety-nine million, nine hundred fifty-one thousand, nine hundred thirty".