198800057 has 4 divisors (see below), whose sum is σ = 210494196. Its totient is φ = 187105920.

The previous prime is 198800053. The next prime is 198800081. The reversal of 198800057 is 750008891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 750008891 = 20533 ⋅36527.

It can be written as a sum of positive squares in 2 ways, for example, as 94167616 + 104632441 = 9704^2 + 10229^2 .

It is a cyclic number.

It is not a de Polignac number, because 198800057 - 2² = 198800053 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198800053) 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 3 ways as a sum of consecutive naturals, for example, 5847044 + ... + 5847077.

It is an arithmetic number, because the mean of its divisors is an integer number (52623549).

Almost surely, 2^198800057 is an apocalyptic number.

198800057 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

198800057 is a deficient number, since it is larger than the sum of its proper divisors (11694139).

198800057 is a wasteful number, since it uses less digits than its factorization.

198800057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11694138.

The product of its (nonzero) digits is 20160, while the sum is 38.

The square root of 198800057 is about 14099.6474069389. The cubic root of 198800057 is about 583.6316492841.

The spelling of 198800057 in words is "one hundred ninety-eight million, eight hundred thousand, fifty-seven".