18293919408 has 60 divisors (see below), whose sum is σ = 51264453240. Its totient is φ = 6090006528.

The previous prime is 18293919401. The next prime is 18293919431. The reversal of 18293919408 is 80491939281.

It is not an unprimeable number, because it can be changed into a prime (18293919401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28135 + ... + 193337.

It is an arithmetic number, because the mean of its divisors is an integer number (854407554).

Almost surely, 2^18293919408 is an apocalyptic number.

18293919408 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18293919408 is an abundant number, since it is smaller than the sum of its proper divisors (32970533832).

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

18293919408 is a wasteful number, since it uses less digits than its factorization.

18293919408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165986 (or 165977 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The spelling of 18293919408 in words is "eighteen billion, two hundred ninety-three million, nine hundred nineteen thousand, four hundred eight".