199992438 has 24 divisors (see below), whose sum is σ = 434538000. Its totient is φ = 66476304.

The previous prime is 199992433. The next prime is 199992449. The reversal of 199992438 is 834299991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199992433) 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 in 11 ways as a sum of consecutive naturals, for example, 9013 + ... + 21936.

It is an arithmetic number, because the mean of its divisors is an integer number (18105750).

Almost surely, 2^199992438 is an apocalyptic number.

199992438 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

199992438 is an abundant number, since it is smaller than the sum of its proper divisors (234545562).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

199992438 is a wasteful number, since it uses less digits than its factorization.

199992438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31316 (or 31313 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 54.

The square root of 199992438 is about 14141.8682641297. The cubic root of 199992438 is about 584.7961770756.

The spelling of 199992438 in words is "one hundred ninety-nine million, nine hundred ninety-two thousand, four hundred thirty-eight".