18007798 has 8 divisors (see below), whose sum is σ = 27640008. Its totient is φ = 8794464.

The previous prime is 18007783. The next prime is 18007817. The reversal of 18007798 is 89770081.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18007798.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104611 + ... + 104782.

It is an arithmetic number, because the mean of its divisors is an integer number (3455001).

Almost surely, 2^18007798 is an apocalyptic number.

18007798 is a deficient number, since it is larger than the sum of its proper divisors (9632210).

18007798 is a wasteful number, since it uses less digits than its factorization.

18007798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209438.

The product of its (nonzero) digits is 28224, while the sum is 40.

The square root of 18007798 is about 4243.5595907210. The cubic root of 18007798 is about 262.1119794041. Note that the first 3 decimals are identical.

The spelling of 18007798 in words is "eighteen million, seven thousand, seven hundred ninety-eight".