199981250 has 72 divisors (see below), whose sum is σ = 436823604. Its totient is φ = 68460000.

The previous prime is 199981247. The next prime is 199981259. The reversal of 199981250 is 52189991.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 45252529 + 154728721 = 6727^2 + 12439^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (199981259) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 305924 + ... + 306576.

Almost surely, 2^199981250 is an apocalyptic number.

199981250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199981250 is an abundant number, since it is smaller than the sum of its proper divisors (236842354).

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

199981250 is an frugal number, since it uses more digits than its factorization.

199981250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694 (or 667 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 44.

The square root of 199981250 is about 14141.4726955858. The cubic root of 199981250 is about 584.7852719606.

The spelling of 199981250 in words is "one hundred ninety-nine million, nine hundred eighty-one thousand, two hundred fifty".