18193808 has 20 divisors (see below), whose sum is σ = 37324620. Its totient is φ = 8561664.

The previous prime is 18193781. The next prime is 18193831. The reversal of 18193808 is 80839181.

It can be written as a sum of positive squares in 2 ways, for example, as 11075584 + 7118224 = 3328^2 + 2668^2 .

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 3 ways as a sum of consecutive naturals, for example, 33173 + ... + 33716.

It is an arithmetic number, because the mean of its divisors is an integer number (1866231).

Almost surely, 2^18193808 is an apocalyptic number.

It is an amenable number.

18193808 is an abundant number, since it is smaller than the sum of its proper divisors (19130812).

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

18193808 is a wasteful number, since it uses less digits than its factorization.

18193808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66914 (or 66908 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 38.

The square root of 18193808 is about 4265.4200262108. The cubic root of 18193808 is about 263.0113774372.

The spelling of 18193808 in words is "eighteen million, one hundred ninety-three thousand, eight hundred eight".