199726438 has 16 divisors (see below), whose sum is σ = 317728224. Its totient is φ = 93836160.

The previous prime is 199726433. The next prime is 199726493. The reversal of 199726438 is 834627991.

It is a junction number, because it is equal to n+sod(n) for n = 199726391 and 199726400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199726433) 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 7 ways as a sum of consecutive naturals, for example, 18031 + ... + 26917.

It is an arithmetic number, because the mean of its divisors is an integer number (19858014).

Almost surely, 2^199726438 is an apocalyptic number.

199726438 is a deficient number, since it is larger than the sum of its proper divisors (118001786).

199726438 is a wasteful number, since it uses less digits than its factorization.

199726438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9567.

The product of its digits is 653184, while the sum is 49.

The square root of 199726438 is about 14132.4604368808. The cubic root of 199726438 is about 584.5367926020.

The spelling of 199726438 in words is "one hundred ninety-nine million, seven hundred twenty-six thousand, four hundred thirty-eight".