19447842 has 16 divisors (see below), whose sum is σ = 39274560. Its totient is φ = 6419472.

The previous prime is 19447807. The next prime is 19447859. The reversal of 19447842 is 24874491.

It is a self number, because there is not a number n which added to its sum of digits gives 19447842.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15117 + ... + 16352.

It is an arithmetic number, because the mean of its divisors is an integer number (2454660).

Almost surely, 2^19447842 is an apocalyptic number.

19447842 is an abundant number, since it is smaller than the sum of its proper divisors (19826718).

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

19447842 is a wasteful number, since it uses less digits than its factorization.

19447842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31577.

The product of its digits is 64512, while the sum is 39.

The square root of 19447842 is about 4409.9707482023. The cubic root of 19447842 is about 268.9204354638.

The spelling of 19447842 in words is "nineteen million, four hundred forty-seven thousand, eight hundred forty-two".