18979204794 has 64 divisors (see below), whose sum is σ = 42930736128. Its totient is φ = 5543331200.

The previous prime is 18979204793. The next prime is 18979204807. The reversal of 18979204794 is 49740297981.

It is a super-2 number, since 2×18979204794² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18979204793) 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, 182347 + ... + 266849.

It is an arithmetic number, because the mean of its divisors is an integer number (670792752).

Almost surely, 2^18979204794 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18979204794, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21465368064).

18979204794 is an abundant number, since it is smaller than the sum of its proper divisors (23951531334).

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

18979204794 is a wasteful number, since it uses less digits than its factorization.

18979204794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84643.

The product of its (nonzero) digits is 9144576, while the sum is 60.

The spelling of 18979204794 in words is "eighteen billion, nine hundred seventy-nine million, two hundred four thousand, seven hundred ninety-four".