18481516 has 12 divisors (see below), whose sum is σ = 34245288. Its totient is φ = 8697152.

The previous prime is 18481511. The next prime is 18481523. The reversal of 18481516 is 61518481.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (18481511) 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, 135826 + ... + 135961.

It is an arithmetic number, because the mean of its divisors is an integer number (2853774).

Almost surely, 2^18481516 is an apocalyptic number.

It is an amenable number.

18481516 is a deficient number, since it is larger than the sum of its proper divisors (15763772).

18481516 is a wasteful number, since it uses less digits than its factorization.

18481516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271808 (or 271806 counting only the distinct ones).

The product of its digits is 7680, while the sum is 34.

The square root of 18481516 is about 4299.0133751827. The cubic root of 18481516 is about 264.3905109876.

Adding to 18481516 its reverse (61518481), we get a palindrome (79999997).

It can be divided in two parts, 1848 and 1516, that added together give a square (3364 = 58²).

The spelling of 18481516 in words is "eighteen million, four hundred eighty-one thousand, five hundred sixteen".