18008778 has 8 divisors (see below), whose sum is σ = 36017568. Its totient is φ = 6002924.

The previous prime is 18008777. The next prime is 18008801. The reversal of 18008778 is 87780081.

It is a happy number.

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

18008778 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (18008777) by changing a digit.

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, 1500726 + ... + 1500737.

It is an arithmetic number, because the mean of its divisors is an integer number (4502196).

Almost surely, 2^18008778 is an apocalyptic number.

18008778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18008778 is a wasteful number, since it uses less digits than its factorization.

18008778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3001468.

The product of its (nonzero) digits is 25088, while the sum is 39.

The square root of 18008778 is about 4243.6750582485. The cubic root of 18008778 is about 262.1167341050.

The spelling of 18008778 in words is "eighteen million, eight thousand, seven hundred seventy-eight".