18548554 has 4 divisors (see below), whose sum is σ = 27822834. Its totient is φ = 9274276.

The previous prime is 18548539. The next prime is 18548561. The reversal of 18548554 is 45584581.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45584581 = 7 ⋅6512083.

It can be written as a sum of positive squares in only one way, i.e., 18020025 + 528529 = 4245^2 + 727^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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, 4637137 + ... + 4637140.

Almost surely, 2^18548554 is an apocalyptic number.

18548554 is a deficient number, since it is larger than the sum of its proper divisors (9274280).

18548554 is an equidigital number, since it uses as much as digits as its factorization.

18548554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9274279.

The product of its digits is 128000, while the sum is 40.

The square root of 18548554 is about 4306.8032228092. The cubic root of 18548554 is about 264.7097997987.

The spelling of 18548554 in words is "eighteen million, five hundred forty-eight thousand, five hundred fifty-four".