198376987 has 2 divisors, whose sum is σ = 198376988. Its totient is φ = 198376986.

The previous prime is 198376973. The next prime is 198376999. The reversal of 198376987 is 789673891.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198376987 is a prime.

It is not a weakly prime, because it can be changed into another prime (198376957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99188493 + 99188494.

It is an arithmetic number, because the mean of its divisors is an integer number (99188494).

Almost surely, 2^198376987 is an apocalyptic number.

198376987 is a deficient number, since it is larger than the sum of its proper divisors (1).

198376987 is an equidigital number, since it uses as much as digits as its factorization.

198376987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4572288, while the sum is 58.

The square root of 198376987 is about 14084.6365590313. The cubic root of 198376987 is about 583.2173428880.

The spelling of 198376987 in words is "one hundred ninety-eight million, three hundred seventy-six thousand, nine hundred eighty-seven".