19783401378 has 128 divisors (see below), whose sum is σ = 46275231744. Its totient is φ = 5588352000.

The previous prime is 19783401317. The next prime is 19783401383. The reversal of 19783401378 is 87310438791.

It is a self number, because there is not a number n which added to its sum of digits gives 19783401378.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7061578 + ... + 7064378.

It is an arithmetic number, because the mean of its divisors is an integer number (361525248).

Almost surely, 2^19783401378 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19783401378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23137615872).

19783401378 is an abundant number, since it is smaller than the sum of its proper divisors (26491830366).

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

19783401378 is a wasteful number, since it uses less digits than its factorization.

19783401378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3000.

The product of its (nonzero) digits is 1016064, while the sum is 51.

The spelling of 19783401378 in words is "nineteen billion, seven hundred eighty-three million, four hundred one thousand, three hundred seventy-eight".