199851850 has 24 divisors (see below), whose sum is σ = 405518688. Its totient is φ = 72673200.

The previous prime is 199851833. The next prime is 199851851. The reversal of 199851850 is 58158991.

It is a self number, because there is not a number n which added to its sum of digits gives 199851850.

It is not an unprimeable number, because it can be changed into a prime (199851851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 181134 + ... + 182233.

It is an arithmetic number, because the mean of its divisors is an integer number (16896612).

Almost surely, 2^199851850 is an apocalyptic number.

199851850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199851850 is an abundant number, since it is smaller than the sum of its proper divisors (205666838).

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

199851850 is a wasteful number, since it uses less digits than its factorization.

199851850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363390 (or 363385 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 46.

The square root of 199851850 is about 14136.8967598975. The cubic root of 199851850 is about 584.6591142310.

The spelling of 199851850 in words is "one hundred ninety-nine million, eight hundred fifty-one thousand, eight hundred fifty".