18518416 has 20 divisors (see below), whose sum is σ = 41005312. Its totient is φ = 7936416.

The previous prime is 18518413. The next prime is 18518417. The reversal of 18518416 is 61481581.

It is a happy number.

It is a super-2 number, since 2×18518416² = 685863462298112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18518413) 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, 82560 + ... + 82783.

Almost surely, 2^18518416 is an apocalyptic number.

18518416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18518416 is an abundant number, since it is smaller than the sum of its proper divisors (22486896).

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

18518416 is a wasteful number, since it uses less digits than its factorization.

18518416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165358 (or 165352 counting only the distinct ones).

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

The square root of 18518416 is about 4303.3029175274. The cubic root of 18518416 is about 264.5663537798.

Adding to 18518416 its reverse (61481581), we get a palindrome (79999997).

The spelling of 18518416 in words is "eighteen million, five hundred eighteen thousand, four hundred sixteen".