199425839 has 2 divisors, whose sum is σ = 199425840. Its totient is φ = 199425838.

The previous prime is 199425833. The next prime is 199425857. The reversal of 199425839 is 938524991.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199425839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199425833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99712919 + 99712920.

It is an arithmetic number, because the mean of its divisors is an integer number (99712920).

Almost surely, 2^199425839 is an apocalyptic number.

199425839 is a deficient number, since it is larger than the sum of its proper divisors (1).

199425839 is an equidigital number, since it uses as much as digits as its factorization.

199425839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 699840, while the sum is 50.

The square root of 199425839 is about 14121.8213768621. The cubic root of 199425839 is about 584.2433922850.

The spelling of 199425839 in words is "one hundred ninety-nine million, four hundred twenty-five thousand, eight hundred thirty-nine".