19406893140208 has 160 divisors (see below), whose sum is σ = 47916533145600. Its totient is φ = 7412647882752.

The previous prime is 19406893140137. The next prime is 19406893140209. The reversal of 19406893140208 is 80204139860491.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19406893140209) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80878266 + ... + 81117862.

It is an arithmetic number, because the mean of its divisors is an integer number (299478332160).

Almost surely, 2^{19406893140208} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19406893140208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23958266572800).

19406893140208 is an abundant number, since it is smaller than the sum of its proper divisors (28509640005392).

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

19406893140208 is a wasteful number, since it uses less digits than its factorization.

19406893140208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241887 (or 241881 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 55.

The spelling of 19406893140208 in words is "nineteen trillion, four hundred six billion, eight hundred ninety-three million, one hundred forty thousand, two hundred eight".