18085878 has 24 divisors (see below), whose sum is σ = 39312000. Its totient is φ = 6009264.

The previous prime is 18085877. The next prime is 18085883. The reversal of 18085878 is 87858081.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18085877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4843 + ... + 7721.

It is an arithmetic number, because the mean of its divisors is an integer number (1638000).

Almost surely, 2^18085878 is an apocalyptic number.

18085878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18085878 is an abundant number, since it is smaller than the sum of its proper divisors (21226122).

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

18085878 is a wasteful number, since it uses less digits than its factorization.

18085878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3236 (or 3233 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 45.

The square root of 18085878 is about 4252.7494635824. The cubic root of 18085878 is about 262.4902635844.

The spelling of 18085878 in words is "eighteen million, eighty-five thousand, eight hundred seventy-eight".