198001943 has 2 divisors, whose sum is σ = 198001944. Its totient is φ = 198001942.

The previous prime is 198001939. The next prime is 198001957. The reversal of 198001943 is 349100891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198001943 - 2² = 198001939 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198001933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99000971 + 99000972.

It is an arithmetic number, because the mean of its divisors is an integer number (99000972).

Almost surely, 2^198001943 is an apocalyptic number.

198001943 is a deficient number, since it is larger than the sum of its proper divisors (1).

198001943 is an equidigital number, since it uses as much as digits as its factorization.

198001943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 198001943 is about 14071.3163207996. The cubic root of 198001943 is about 582.8495748391.

The spelling of 198001943 in words is "one hundred ninety-eight million, one thousand, nine hundred forty-three".