18436878 has 96 divisors (see below), whose sum is σ = 45527040. Its totient is φ = 5365440.

The previous prime is 18436871. The next prime is 18436879. The reversal of 18436878 is 87863481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18436871) 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 47 ways as a sum of consecutive naturals, for example, 392251 + ... + 392297.

It is an arithmetic number, because the mean of its divisors is an integer number (474240).

Almost surely, 2^18436878 is an apocalyptic number.

18436878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18436878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22763520).

18436878 is an abundant number, since it is smaller than the sum of its proper divisors (27090162).

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

18436878 is a wasteful number, since it uses less digits than its factorization.

18436878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 139 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 18436878 is about 4293.8185802383. The cubic root of 18436878 is about 264.1774805199.

The spelling of 18436878 in words is "eighteen million, four hundred thirty-six thousand, eight hundred seventy-eight".