19478442252 has 18 divisors (see below), whose sum is σ = 45450826708. Its totient is φ = 6492652928.

The previous prime is 19478442199. The next prime is 19478442259. The reversal of 19478442252 is 25224487491.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (19478442259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 463324 + ... + 503612.

Almost surely, 2^19478442252 is an apocalyptic number.

19478442252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19478442252 is an abundant number, since it is smaller than the sum of its proper divisors (25972384456).

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

19478442252 is an frugal number, since it uses more digits than its factorization.

19478442252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80585 (or 40294 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 48.

Multiplying 19478442252 by its sum of digits (48), we get a square (934965228096 = 966936²).

The spelling of 19478442252 in words is "nineteen billion, four hundred seventy-eight million, four hundred forty-two thousand, two hundred fifty-two".