19400779312 has 160 divisors (see below), whose sum is σ = 42425856000. Its totient is φ = 8551445760.

The previous prime is 19400779303. The next prime is 19400779327. The reversal of 19400779312 is 21397700491.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54040989 + ... + 54041347.

It is an arithmetic number, because the mean of its divisors is an integer number (265161600).

Almost surely, 2^19400779312 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 19400779312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21212928000).

19400779312 is an abundant number, since it is smaller than the sum of its proper divisors (23025076688).

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

19400779312 is a wasteful number, since it uses less digits than its factorization.

19400779312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599 (or 593 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 43.

The spelling of 19400779312 in words is "nineteen billion, four hundred million, seven hundred seventy-nine thousand, three hundred twelve".