18449538 has 8 divisors (see below), whose sum is σ = 36899088. Its totient is φ = 6149844.

The previous prime is 18449533. The next prime is 18449567. The reversal of 18449538 is 83594481.

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

18449538 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 18449538.

It is not an unprimeable number, because it can be changed into a prime (18449531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1537456 + ... + 1537467.

It is an arithmetic number, because the mean of its divisors is an integer number (4612386).

Almost surely, 2^18449538 is an apocalyptic number.

18449538 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.

18449538 is a wasteful number, since it uses less digits than its factorization.

18449538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3074928.

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

The square root of 18449538 is about 4295.2925395135. The cubic root of 18449538 is about 264.2379340247.

The spelling of 18449538 in words is "eighteen million, four hundred forty-nine thousand, five hundred thirty-eight".