198387859 has 2 divisors, whose sum is σ = 198387860. Its totient is φ = 198387858.

The previous prime is 198387779. The next prime is 198387863. The reversal of 198387859 is 958783891.

198387859 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 198387859 - 2²⁷ = 64170131 is a prime.

It is not a weakly prime, because it can be changed into another prime (198384859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99193929 + 99193930.

It is an arithmetic number, because the mean of its divisors is an integer number (99193930).

Almost surely, 2^198387859 is an apocalyptic number.

198387859 is a deficient number, since it is larger than the sum of its proper divisors (1).

198387859 is an equidigital number, since it uses as much as digits as its factorization.

198387859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 58.

The square root of 198387859 is about 14085.0225061943. The cubic root of 198387859 is about 583.2279970525.

The spelling of 198387859 in words is "one hundred ninety-eight million, three hundred eighty-seven thousand, eight hundred fifty-nine".