18912418394 has 8 divisors (see below), whose sum is σ = 28385650368. Its totient is φ = 9450534940.

The previous prime is 18912418361. The next prime is 18912418397. The reversal of 18912418394 is 49381421981.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (18912418397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2832962 + ... + 2839629.

It is an arithmetic number, because the mean of its divisors is an integer number (3548206296).

Almost surely, 2^18912418394 is an apocalyptic number.

18912418394 is a deficient number, since it is larger than the sum of its proper divisors (9473231974).

18912418394 is a wasteful number, since it uses less digits than its factorization.

18912418394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5674260.

The product of its digits is 497664, while the sum is 50.

The spelling of 18912418394 in words is "eighteen billion, nine hundred twelve million, four hundred eighteen thousand, three hundred ninety-four".