199193890 has 32 divisors (see below), whose sum is σ = 412781184. Its totient is φ = 67793280.

The previous prime is 199193809. The next prime is 199193899. The reversal of 199193890 is 98391991.

It is not an unprimeable number, because it can be changed into a prime (199193899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 796 + ... + 19975.

It is an arithmetic number, because the mean of its divisors is an integer number (12899412).

Almost surely, 2^199193890 is an apocalyptic number.

199193890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199193890 is an abundant number, since it is smaller than the sum of its proper divisors (213587294).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

199193890 is a wasteful number, since it uses less digits than its factorization.

199193890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20922.

The product of its (nonzero) digits is 157464, while the sum is 49.

The square root of 199193890 is about 14113.6065553777. The cubic root of 199193890 is about 584.0167963675.

The spelling of 199193890 in words is "one hundred ninety-nine million, one hundred ninety-three thousand, eight hundred ninety".