18236838 has 16 divisors (see below), whose sum is σ = 38059776. Its totient is φ = 5814600.

The previous prime is 18236833. The next prime is 18236839. The reversal of 18236838 is 83863281.

It is a junction number, because it is equal to n+sod(n) for n = 18236796 and 18236805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18236833) 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 7 ways as a sum of consecutive naturals, for example, 65938 + ... + 66213.

It is an arithmetic number, because the mean of its divisors is an integer number (2378736).

Almost surely, 2^18236838 is an apocalyptic number.

18236838 is an abundant number, since it is smaller than the sum of its proper divisors (19822938).

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

18236838 is a wasteful number, since it uses less digits than its factorization.

18236838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132179.

The product of its digits is 55296, while the sum is 39.

The square root of 18236838 is about 4270.4610992257. The cubic root of 18236838 is about 263.2185627438.

The spelling of 18236838 in words is "eighteen million, two hundred thirty-six thousand, eight hundred thirty-eight".