18449238 has 8 divisors (see below), whose sum is σ = 36898488. Its totient is φ = 6149744.

The previous prime is 18449237. The next prime is 18449251. The reversal of 18449238 is 83294481.

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

18449238 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 18449196 and 18449205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18449237) 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, 1537431 + ... + 1537442.

It is an arithmetic number, because the mean of its divisors is an integer number (4612311).

Almost surely, 2^18449238 is an apocalyptic number.

18449238 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.

18449238 is a wasteful number, since it uses less digits than its factorization.

18449238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3074878.

The product of its digits is 55296, while the sum is 39.

The square root of 18449238 is about 4295.2576174195. The cubic root of 18449238 is about 264.2365017971.

The spelling of 18449238 in words is "eighteen million, four hundred forty-nine thousand, two hundred thirty-eight".