18238806 has 12 divisors (see below), whose sum is σ = 39517452. Its totient is φ = 6079596.

The previous prime is 18238789. The next prime is 18238811. The reversal of 18238806 is 60883281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 506616 + ... + 506651.

It is an arithmetic number, because the mean of its divisors is an integer number (3293121).

Almost surely, 2^18238806 is an apocalyptic number.

18238806 is an abundant number, since it is smaller than the sum of its proper divisors (21278646).

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

18238806 is a wasteful number, since it uses less digits than its factorization.

18238806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013275 (or 1013272 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 18238806 is about 4270.6915130925. The cubic root of 18238806 is about 263.2280306772.

It can be divided in two parts, 18238 and 806, that added together give a square (19044 = 138²).

The spelling of 18238806 in words is "eighteen million, two hundred thirty-eight thousand, eight hundred six".