18815016 has 128 divisors (see below), whose sum is σ = 56217600. Its totient is φ = 5227200.

The previous prime is 18815009. The next prime is 18815029. The reversal of 18815016 is 61051881.

18815016 = T₃₈₁ + T₃₈₂ + ... + T₅₅₁.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 606921 + ... + 606951.

It is an arithmetic number, because the mean of its divisors is an integer number (439200).

Almost surely, 2^18815016 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 18815016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28108800).

18815016 is an abundant number, since it is smaller than the sum of its proper divisors (37402584).

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

18815016 is a wasteful number, since it uses less digits than its factorization.

18815016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92 (or 66 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 30.

The square root of 18815016 is about 4337.6279231857. The cubic root of 18815016 is about 265.9713538790.

Adding to 18815016 its reverse (61051881), we get a palindrome (79866897).

The spelling of 18815016 in words is "eighteen million, eight hundred fifteen thousand, sixteen".