18116838 has 32 divisors (see below), whose sum is σ = 40629600. Its totient is φ = 5983488.

The previous prime is 18116827. The next prime is 18116863. The reversal of 18116838 is 83861181.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 4618 + ... + 7586.

It is an arithmetic number, because the mean of its divisors is an integer number (1269675).

Almost surely, 2^18116838 is an apocalyptic number.

18116838 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 18116838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20314800).

18116838 is an abundant number, since it is smaller than the sum of its proper divisors (22512762).

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

18116838 is a wasteful number, since it uses less digits than its factorization.

18116838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3093 (or 3087 counting only the distinct ones).

The product of its digits is 9216, while the sum is 36.

The square root of 18116838 is about 4256.3879052549. The cubic root of 18116838 is about 262.6399580179.

It can be divided in two parts, 1811 and 6838, that added together give a square (8649 = 93²).

The spelling of 18116838 in words is "eighteen million, one hundred sixteen thousand, eight hundred thirty-eight".