18481544 has 8 divisors (see below), whose sum is σ = 34652910. Its totient is φ = 9240768.

The previous prime is 18481543. The next prime is 18481553. The reversal of 18481544 is 44518481.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17556100 + 925444 = 4190^2 + 962^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (18481543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1155089 + ... + 1155104.

Almost surely, 2^18481544 is an apocalyptic number.

It is an amenable number.

18481544 is a deficient number, since it is larger than the sum of its proper divisors (16171366).

18481544 is a wasteful number, since it uses less digits than its factorization.

18481544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2310199 (or 2310195 counting only the distinct ones).

The product of its digits is 20480, while the sum is 35.

The square root of 18481544 is about 4299.0166317427. The cubic root of 18481544 is about 264.3906445071.

The spelling of 18481544 in words is "eighteen million, four hundred eighty-one thousand, five hundred forty-four".