198869057 has 4 divisors (see below), whose sum is σ = 199661616. Its totient is φ = 198076500.

The previous prime is 198869051. The next prime is 198869081. The reversal of 198869057 is 750968891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 198869057 - 2²⁰ = 197820481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198869051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 395903 + ... + 396404.

It is an arithmetic number, because the mean of its divisors is an integer number (49915404).

Almost surely, 2^198869057 is an apocalyptic number.

It is an amenable number.

198869057 is a deficient number, since it is larger than the sum of its proper divisors (792559).

198869057 is an equidigital number, since it uses as much as digits as its factorization.

198869057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792558.

The product of its (nonzero) digits is 1088640, while the sum is 53.

The square root of 198869057 is about 14102.0940643580. The cubic root of 198869057 is about 583.6991642305.

The spelling of 198869057 in words is "one hundred ninety-eight million, eight hundred sixty-nine thousand, fifty-seven".