198842939 has 2 divisors, whose sum is σ = 198842940. Its totient is φ = 198842938.

The previous prime is 198842933. The next prime is 198842951. The reversal of 198842939 is 939248891.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198842939 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (198842933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99421469 + 99421470.

It is an arithmetic number, because the mean of its divisors is an integer number (99421470).

Almost surely, 2^198842939 is an apocalyptic number.

198842939 is a deficient number, since it is larger than the sum of its proper divisors (1).

198842939 is an equidigital number, since it uses as much as digits as its factorization.

198842939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1119744, while the sum is 53.

The square root of 198842939 is about 14101.1680012685. The cubic root of 198842939 is about 583.6736101927.

The spelling of 198842939 in words is "one hundred ninety-eight million, eight hundred forty-two thousand, nine hundred thirty-nine".