18368838 has 12 divisors (see below), whose sum is σ = 39799188. Its totient is φ = 6122940.

The previous prime is 18368837. The next prime is 18368851. The reversal of 18368838 is 83886381.

It is a junction number, because it is equal to n+sod(n) for n = 18368793 and 18368802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18368837) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 510228 + ... + 510263.

It is an arithmetic number, because the mean of its divisors is an integer number (3316599).

Almost surely, 2^18368838 is an apocalyptic number.

18368838 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18368838 is an abundant number, since it is smaller than the sum of its proper divisors (21430350).

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

18368838 is a wasteful number, since it uses less digits than its factorization.

18368838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1020499 (or 1020496 counting only the distinct ones).

The product of its digits is 221184, while the sum is 45.

The square root of 18368838 is about 4285.8882393268. Note that the first 3 decimals coincide. The cubic root of 18368838 is about 263.8521038012.

The spelling of 18368838 in words is "eighteen million, three hundred sixty-eight thousand, eight hundred thirty-eight".