19400779311 has 8 divisors (see below), whose sum is σ = 25876308864. Its totient is φ = 12929551320.

The previous prime is 19400779303. The next prime is 19400779327. The reversal of 19400779311 is 11397700491.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19400779311 - 2³ = 19400779303 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19400779361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1064851 + ... + 1082916.

It is an arithmetic number, because the mean of its divisors is an integer number (3234538608).

Almost surely, 2^19400779311 is an apocalyptic number.

19400779311 is a deficient number, since it is larger than the sum of its proper divisors (6475529553).

19400779311 is a wasteful number, since it uses less digits than its factorization.

19400779311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2150781.

The product of its (nonzero) digits is 47628, while the sum is 42.

The spelling of 19400779311 in words is "nineteen billion, four hundred million, seven hundred seventy-nine thousand, three hundred eleven".