19842740906 has 8 divisors (see below), whose sum is σ = 29795744484. Its totient is φ = 9910826080.

The previous prime is 19842740903. The next prime is 19842740977. The reversal of 19842740906 is 60904724891.

It can be written as a sum of positive squares in 2 ways, for example, as 18353475625 + 1489265281 = 135475^2 + 38591^2 .

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

It is a super-4 number, since 4×19842740906⁴ (a number of 42 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (19842740903) 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, 5269835 + ... + 5273598.

Almost surely, 2^19842740906 is an apocalyptic number.

19842740906 is a deficient number, since it is larger than the sum of its proper divisors (9953003578).

19842740906 is a wasteful number, since it uses less digits than its factorization.

19842740906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10544376.

The product of its (nonzero) digits is 870912, while the sum is 50.

The spelling of 19842740906 in words is "nineteen billion, eight hundred forty-two million, seven hundred forty thousand, nine hundred six".