19179742040 has 64 divisors (see below), whose sum is σ = 45831497760. Its totient is φ = 7198709760.

The previous prime is 19179742013. The next prime is 19179742051. The reversal of 19179742040 is 4024797191.

It is a junction number, because it is equal to n+sod(n) for n = 19179741982 and 19179742000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182474 + ... + 267686.

Almost surely, 2^19179742040 is an apocalyptic number.

19179742040 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 19179742040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22915748880).

19179742040 is an abundant number, since it is smaller than the sum of its proper divisors (26651755720).

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

19179742040 is a wasteful number, since it uses less digits than its factorization.

19179742040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85572 (or 85568 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 44.

The spelling of 19179742040 in words is "nineteen billion, one hundred seventy-nine million, seven hundred forty-two thousand, forty".