18237138 has 8 divisors (see below), whose sum is σ = 36474288. Its totient is φ = 6079044.

The previous prime is 18237133. The next prime is 18237139. The reversal of 18237138 is 83173281.

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

18237138 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 18237099 and 18237108.

It is not an unprimeable number, because it can be changed into a prime (18237133) 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, 1519756 + ... + 1519767.

It is an arithmetic number, because the mean of its divisors is an integer number (4559286).

Almost surely, 2^18237138 is an apocalyptic number.

18237138 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.

18237138 is a wasteful number, since it uses less digits than its factorization.

18237138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3039528.

The product of its digits is 8064, while the sum is 33.

The square root of 18237138 is about 4270.4962240939. The cubic root of 18237138 is about 263.2200060704.

The spelling of 18237138 in words is "eighteen million, two hundred thirty-seven thousand, one hundred thirty-eight".