18471516 has 48 divisors (see below), whose sum is σ = 49787136. Its totient is φ = 5220864.

The previous prime is 18471511. The next prime is 18471527. The reversal of 18471516 is 61517481.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18471511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7015 + ... + 9281.

It is an arithmetic number, because the mean of its divisors is an integer number (1037232).

Almost surely, 2^18471516 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18471516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24893568).

18471516 is an abundant number, since it is smaller than the sum of its proper divisors (31315620).

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

18471516 is a wasteful number, since it uses less digits than its factorization.

18471516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2378 (or 2376 counting only the distinct ones).

The product of its digits is 6720, while the sum is 33.

The square root of 18471516 is about 4297.8501602545. The cubic root of 18471516 is about 264.3428168102.

Adding to 18471516 its reverse (61517481), we get a palindrome (79988997).

The spelling of 18471516 in words is "eighteen million, four hundred seventy-one thousand, five hundred sixteen".