199919747 has 2 divisors, whose sum is σ = 199919748. Its totient is φ = 199919746.

The previous prime is 199919701. The next prime is 199919773. The reversal of 199919747 is 747919991.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199919747 - 2¹⁶ = 199854211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 199919692 and 199919701.

It is not a weakly prime, because it can be changed into another prime (199919777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99959873 + 99959874.

It is an arithmetic number, because the mean of its divisors is an integer number (99959874).

Almost surely, 2^199919747 is an apocalyptic number.

199919747 is a deficient number, since it is larger than the sum of its proper divisors (1).

199919747 is an equidigital number, since it uses as much as digits as its factorization.

199919747 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1285956, while the sum is 56.

The square root of 199919747 is about 14139.2979670138. The cubic root of 199919747 is about 584.7253167794.

The spelling of 199919747 in words is "one hundred ninety-nine million, nine hundred nineteen thousand, seven hundred forty-seven".