18382538 has 8 divisors (see below), whose sum is σ = 29025120. Its totient is φ = 8707500.

The previous prime is 18382537. The next prime is 18382547. The reversal of 18382538 is 83528381.

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

It is a Harshad number since it is a multiple of its sum of digits (38), and also a Moran number because the ratio is a prime number: 483751 = 18382538 / (1 + 8 + 3 + 8 + 2 + 5 + 3 + 8).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18382537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241838 + ... + 241913.

It is an arithmetic number, because the mean of its divisors is an integer number (3628140).

Almost surely, 2^18382538 is an apocalyptic number.

18382538 is a deficient number, since it is larger than the sum of its proper divisors (10642582).

18382538 is a wasteful number, since it uses less digits than its factorization.

18382538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483772.

The product of its digits is 46080, while the sum is 38.

The square root of 18382538 is about 4287.4862098904. The cubic root of 18382538 is about 263.9176836259.

The spelling of 18382538 in words is "eighteen million, three hundred eighty-two thousand, five hundred thirty-eight".