18478144 has 28 divisors (see below), whose sum is σ = 37453824. Its totient is φ = 9041024.

The previous prime is 18478123. The next prime is 18478147. The reversal of 18478144 is 44187481.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18478147) 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, 64 + ... + 6079.

Almost surely, 2^18478144 is an apocalyptic number.

It is an amenable number.

18478144 is an abundant number, since it is smaller than the sum of its proper divisors (18975680).

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

18478144 is an equidigital number, since it uses as much as digits as its factorization.

18478144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6202 (or 6192 counting only the distinct ones).

The product of its digits is 28672, while the sum is 37.

The square root of 18478144 is about 4298.6211742837. The cubic root of 18478144 is about 264.3744304339.

The spelling of 18478144 in words is "eighteen million, four hundred seventy-eight thousand, one hundred forty-four".