19018423440 has 120 divisors (see below), whose sum is σ = 64952896320. Its totient is φ = 4985609472.

The previous prime is 19018423397. The next prime is 19018423511. The reversal of 19018423440 is 4432481091.

It is a happy number.

19018423440 is a `hidden beast` number, since 19 + 0 + 184 + 23 + 440 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 19018423395 and 19018423404.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 181372 + ... + 266331.

It is an arithmetic number, because the mean of its divisors is an integer number (541274136).

Almost surely, 2^19018423440 is an apocalyptic number.

19018423440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19018423440 is an abundant number, since it is smaller than the sum of its proper divisors (45934472880).

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

19018423440 is a wasteful number, since it uses less digits than its factorization.

19018423440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447781 (or 447772 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The spelling of 19018423440 in words is "nineteen billion, eighteen million, four hundred twenty-three thousand, four hundred forty".