199840126 has 8 divisors (see below), whose sum is σ = 299823840. Its totient is φ = 99898848.

The previous prime is 199840111. The next prime is 199840127. The reversal of 199840126 is 621048991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199840127) 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 3 ways as a sum of consecutive naturals, for example, 7035 + ... + 21193.

It is an arithmetic number, because the mean of its divisors is an integer number (37477980).

Almost surely, 2^199840126 is an apocalyptic number.

199840126 is a deficient number, since it is larger than the sum of its proper divisors (99983714).

199840126 is a wasteful number, since it uses less digits than its factorization.

199840126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21218.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 199840126 is about 14136.4820942128. The cubic root of 199840126 is about 584.6476812996.

It can be divided in two parts, 1998 and 40126, that added together give a palindrome (42124).

The spelling of 199840126 in words is "one hundred ninety-nine million, eight hundred forty thousand, one hundred twenty-six".