198949783 has 2 divisors, whose sum is σ = 198949784. Its totient is φ = 198949782.

The previous prime is 198949781. The next prime is 198949787. The reversal of 198949783 is 387949891.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198949783 - 2¹ = 198949781 is a prime.

Together with 198949781, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198949781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99474891 + 99474892.

It is an arithmetic number, because the mean of its divisors is an integer number (99474892).

Almost surely, 2^198949783 is an apocalyptic number.

198949783 is a deficient number, since it is larger than the sum of its proper divisors (1).

198949783 is an equidigital number, since it uses as much as digits as its factorization.

198949783 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3919104, while the sum is 58.

The square root of 198949783 is about 14104.9559729905. The cubic root of 198949783 is about 583.7781329838.

The spelling of 198949783 in words is "one hundred ninety-eight million, nine hundred forty-nine thousand, seven hundred eighty-three".