199640783 has 2 divisors, whose sum is σ = 199640784. Its totient is φ = 199640782.

The previous prime is 199640737. The next prime is 199640827. The reversal of 199640783 is 387046991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199640783 - 2¹⁶ = 199575247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199640723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99820391 + 99820392.

It is an arithmetic number, because the mean of its divisors is an integer number (99820392).

Almost surely, 2^199640783 is an apocalyptic number.

199640783 is a deficient number, since it is larger than the sum of its proper divisors (1).

199640783 is an equidigital number, since it uses as much as digits as its factorization.

199640783 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 199640783 is about 14129.4296770960. The cubic root of 199640783 is about 584.4532188587.

The spelling of 199640783 in words is "one hundred ninety-nine million, six hundred forty thousand, seven hundred eighty-three".