199969439 has 2 divisors, whose sum is σ = 199969440. Its totient is φ = 199969438.

The previous prime is 199969421. The next prime is 199969457. The reversal of 199969439 is 934969991.

It is a balanced prime because it is at equal distance from previous prime (199969421) and next prime (199969457).

It is a cyclic number.

It is not a de Polignac number, because 199969439 - 2⁸ = 199969183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199969409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99984719 + 99984720.

It is an arithmetic number, because the mean of its divisors is an integer number (99984720).

Almost surely, 2^199969439 is an apocalyptic number.

199969439 is a deficient number, since it is larger than the sum of its proper divisors (1).

199969439 is an equidigital number, since it uses as much as digits as its factorization.

199969439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4251528, while the sum is 59.

The square root of 199969439 is about 14141.0550879346. The cubic root of 199969439 is about 584.7737591565.

The spelling of 199969439 in words is "one hundred ninety-nine million, nine hundred sixty-nine thousand, four hundred thirty-nine".