199899450 has 72 divisors (see below), whose sum is σ = 541322496. Its totient is φ = 52884000.

The previous prime is 199899449. The next prime is 199899461. The reversal of 199899450 is 54998991.

199899450 is a `hidden beast` number, since 19 + 98 + 99 + 450 = 666.

It is a super-2 number, since 2×199899450² = 79919580220605000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 57255 + ... + 60645.

It is an arithmetic number, because the mean of its divisors is an integer number (7518368).

Almost surely, 2^199899450 is an apocalyptic number.

199899450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 199899450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270661248).

199899450 is an abundant number, since it is smaller than the sum of its proper divisors (341423046).

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

199899450 is a wasteful number, since it uses less digits than its factorization.

199899450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3540 (or 3532 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 54.

The square root of 199899450 is about 14138.5801974597. The cubic root of 199899450 is about 584.7055278864.

The spelling of 199899450 in words is "one hundred ninety-nine million, eight hundred ninety-nine thousand, four hundred fifty".