198887039 has 4 divisors (see below), whose sum is σ = 214186056. Its totient is φ = 183588024.

The previous prime is 198886991. The next prime is 198887081. The reversal of 198887039 is 930788891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198887039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198889039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7649489 + ... + 7649514.

It is an arithmetic number, because the mean of its divisors is an integer number (53546514).

Almost surely, 2^198887039 is an apocalyptic number.

198887039 is a deficient number, since it is larger than the sum of its proper divisors (15299017).

198887039 is a wasteful number, since it uses less digits than its factorization.

198887039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15299016.

The product of its (nonzero) digits is 870912, while the sum is 53.

The square root of 198887039 is about 14102.7316148326. The cubic root of 198887039 is about 583.7167566474.

The spelling of 198887039 in words is "one hundred ninety-eight million, eight hundred eighty-seven thousand, thirty-nine".