18481508 has 6 divisors (see below), whose sum is σ = 32342646. Its totient is φ = 9240752.

The previous prime is 18481501. The next prime is 18481511. The reversal of 18481508 is 80518481.

It can be written as a sum of positive squares in only one way, i.e., 12902464 + 5579044 = 3592^2 + 2362^2 .

It is a super-3 number, since 3×18481508³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (18481501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2310185 + ... + 2310192.

It is an arithmetic number, because the mean of its divisors is an integer number (5390441).

Almost surely, 2^18481508 is an apocalyptic number.

It is an amenable number.

18481508 is a deficient number, since it is larger than the sum of its proper divisors (13861138).

18481508 is a wasteful number, since it uses less digits than its factorization.

18481508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4620381 (or 4620379 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 35.

The square root of 18481508 is about 4299.0124447366. The cubic root of 18481508 is about 264.3904728391.

Adding to 18481508 its reverse (80518481), we get a palindrome (98999989).

The spelling of 18481508 in words is "eighteen million, four hundred eighty-one thousand, five hundred eight".