19019786040 has 128 divisors (see below), whose sum is σ = 63652780800. Its totient is φ = 5051664000.

The previous prime is 19019786017. The next prime is 19019786047. The reversal of 19019786040 is 4068791091.

It is a happy number.

It is a super-2 number, since 2×19019786040² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19019786047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 235999 + ... + 306161.

It is an arithmetic number, because the mean of its divisors is an integer number (497287350).

Almost surely, 2^19019786040 is an apocalyptic number.

19019786040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19019786040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31826390400).

19019786040 is an abundant number, since it is smaller than the sum of its proper divisors (44632994760).

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

19019786040 is a wasteful number, since it uses less digits than its factorization.

19019786040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70434 (or 70424 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The spelling of 19019786040 in words is "nineteen billion, nineteen million, seven hundred eighty-six thousand, forty".