18438484 has 6 divisors (see below), whose sum is σ = 32267354. Its totient is φ = 9219240.

The previous prime is 18438481. The next prime is 18438491. The reversal of 18438484 is 48483481.

It can be written as a sum of positive squares in only one way, i.e., 17875984 + 562500 = 4228^2 + 750^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18438481) 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 as a sum of consecutive naturals, namely, 2304807 + ... + 2304814.

Almost surely, 2^18438484 is an apocalyptic number.

It is an amenable number.

18438484 is a deficient number, since it is larger than the sum of its proper divisors (13828870).

18438484 is a wasteful number, since it uses less digits than its factorization.

18438484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4609625 (or 4609623 counting only the distinct ones).

The product of its digits is 98304, while the sum is 40.

The square root of 18438484 is about 4294.0055891906. The cubic root of 18438484 is about 264.1851509565.

The spelling of 18438484 in words is "eighteen million, four hundred thirty-eight thousand, four hundred eighty-four".