18113616 has 30 divisors (see below), whose sum is σ = 50693370. Its totient is φ = 6037824.

The previous prime is 18113611. The next prime is 18113647. The reversal of 18113616 is 61631181.

It can be written as a sum of positive squares in only one way, i.e., 15210000 + 2903616 = 3900^2 + 1704^2 .

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 18113616.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18113611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 62751 + ... + 63038.

It is an arithmetic number, because the mean of its divisors is an integer number (1689779).

Almost surely, 2^18113616 is an apocalyptic number.

18113616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18113616 is an abundant number, since it is smaller than the sum of its proper divisors (32579754).

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

18113616 is a wasteful number, since it uses less digits than its factorization.

18113616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125803 (or 125794 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 18113616 is about 4256.0093984859. The cubic root of 18113616 is about 262.6243873075.

Adding to 18113616 its reverse (61631181), we get a palindrome (79744797).

The spelling of 18113616 in words is "eighteen million, one hundred thirteen thousand, six hundred sixteen".