199800050 has 18 divisors (see below), whose sum is σ = 371814093. Its totient is φ = 79880040.

The previous prime is 199800049. The next prime is 199800091. The reversal of 199800050 is 50008991.

It can be written as a sum of positive squares in 2 ways, for example, as 195804049 + 3996001 = 13993^2 + 1999^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=9995.

It is a super-4 number, since 4×199800050⁴ (a number of 34 digits) contains 4444 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 98951 + ... + 100949.

Almost surely, 2^199800050 is an apocalyptic number.

199800050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199800050 is a deficient number, since it is larger than the sum of its proper divisors (172014043).

199800050 is an frugal number, since it uses more digits than its factorization.

199800050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4010 (or 2006 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 199800050 is about 14135.0645559191. The cubic root of 199800050 is about 584.6085968785.

Multiplying 199800050 by its sum of digits (32), we get a square (6393601600 = 79960²).

The spelling of 199800050 in words is "one hundred ninety-nine million, eight hundred thousand, fifty".