18032516 has 6 divisors (see below), whose sum is σ = 31556910. Its totient is φ = 9016256.

The previous prime is 18032513. The next prime is 18032587. The reversal of 18032516 is 61523081.

It can be written as a sum of positive squares in only one way, i.e., 14032516 + 4000000 = 3746^2 + 2000^2 .

It is not an unprimeable number, because it can be changed into a prime (18032513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2254061 + ... + 2254068.

It is an arithmetic number, because the mean of its divisors is an integer number (5259485).

Almost surely, 2^18032516 is an apocalyptic number.

It is an amenable number.

18032516 is a deficient number, since it is larger than the sum of its proper divisors (13524394).

18032516 is a wasteful number, since it uses less digits than its factorization.

18032516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4508133 (or 4508131 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 18032516 is about 4246.4710054350. The cubic root of 18032516 is about 262.2318519504.

Adding to 18032516 its reverse (61523081), we get a palindrome (79555597).

The spelling of 18032516 in words is "eighteen million, thirty-two thousand, five hundred sixteen".