19478386244 has 24 divisors (see below), whose sum is σ = 34411052928. Its totient is φ = 9647074080.

The previous prime is 19478386241. The next prime is 19478386247. The reversal of 19478386244 is 44268387491.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (19478386241) and next prime (19478386247).

It is a self number, because there is not a number n which added to its sum of digits gives 19478386244.

It is not an unprimeable number, because it can be changed into a prime (19478386241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135599 + ... + 239465.

It is an arithmetic number, because the mean of its divisors is an integer number (1433793872).

Almost surely, 2^19478386244 is an apocalyptic number.

It is an amenable number.

19478386244 is a deficient number, since it is larger than the sum of its proper divisors (14932666684).

19478386244 is a wasteful number, since it uses less digits than its factorization.

19478386244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104315 (or 104313 counting only the distinct ones).

The product of its digits is 9289728, while the sum is 56.

The spelling of 19478386244 in words is "nineteen billion, four hundred seventy-eight million, three hundred eighty-six thousand, two hundred forty-four".