18683538 has 8 divisors (see below), whose sum is σ = 37367088. Its totient is φ = 6227844.

The previous prime is 18683537. The next prime is 18683551. The reversal of 18683538 is 83538681.

It is a sphenic number, since it is the product of 3 distinct primes.

18683538 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 18683538.

It is not an unprimeable number, because it can be changed into a prime (18683537) 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 3 ways as a sum of consecutive naturals, for example, 1556956 + ... + 1556967.

It is an arithmetic number, because the mean of its divisors is an integer number (4670886).

Almost surely, 2^18683538 is an apocalyptic number.

18683538 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18683538 is a wasteful number, since it uses less digits than its factorization.

It is an anagram of its base 9 representation: 18683538 = (38135886)₉.

18683538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3113928.

The product of its digits is 138240, while the sum is 42.

The square root of 18683538 is about 4322.4458354038. The cubic root of 18683538 is about 265.3503755092.

The spelling of 18683538 in words is "eighteen million, six hundred eighty-three thousand, five hundred thirty-eight".