198040643 has 2 divisors, whose sum is σ = 198040644. Its totient is φ = 198040642.

The previous prime is 198040637. The next prime is 198040669. The reversal of 198040643 is 346040891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198040643 - 2⁸ = 198040387 is a prime.

It is not a weakly prime, because it can be changed into another prime (198040693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99020321 + 99020322.

It is an arithmetic number, because the mean of its divisors is an integer number (99020322).

Almost surely, 2^198040643 is an apocalyptic number.

198040643 is a deficient number, since it is larger than the sum of its proper divisors (1).

198040643 is an equidigital number, since it uses as much as digits as its factorization.

198040643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 198040643 is about 14072.6913914859. The cubic root of 198040643 is about 582.8875455257.

The spelling of 198040643 in words is "one hundred ninety-eight million, forty thousand, six hundred forty-three".