18438648 has 32 divisors (see below), whose sum is σ = 46550400. Its totient is φ = 6085728.

The previous prime is 18438619. The next prime is 18438649. The reversal of 18438648 is 84683481.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18438649) 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 7 ways as a sum of consecutive naturals, for example, 1258 + ... + 6201.

It is an arithmetic number, because the mean of its divisors is an integer number (1454700).

Almost surely, 2^18438648 is an apocalyptic number.

It is an amenable number.

18438648 is an abundant number, since it is smaller than the sum of its proper divisors (28111752).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18438648 is a wasteful number, since it uses less digits than its factorization.

18438648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7571 (or 7567 counting only the distinct ones).

The product of its digits is 147456, while the sum is 42.

The square root of 18438648 is about 4294.0246855369. The cubic root of 18438648 is about 264.1859342139.

The spelling of 18438648 in words is "eighteen million, four hundred thirty-eight thousand, six hundred forty-eight".