198740719 has 2 divisors, whose sum is σ = 198740720. Its totient is φ = 198740718.

The previous prime is 198740701. The next prime is 198740743. The reversal of 198740719 is 917047891.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198740719 is a prime.

It is a super-2 number, since 2×198740719² = 78995746777273922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198740119) 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, 99370359 + 99370360.

It is an arithmetic number, because the mean of its divisors is an integer number (99370360).

Almost surely, 2^198740719 is an apocalyptic number.

198740719 is a deficient number, since it is larger than the sum of its proper divisors (1).

198740719 is an equidigital number, since it uses as much as digits as its factorization.

198740719 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 46.

The square root of 198740719 is about 14097.5430128799. The cubic root of 198740719 is about 583.5735758919.

The spelling of 198740719 in words is "one hundred ninety-eight million, seven hundred forty thousand, seven hundred nineteen".