11218520 has 16 divisors (see below), whose sum is σ = 25241760. Its totient is φ = 4487392.

The previous prime is 11218517. The next prime is 11218573. The reversal of 11218520 is 2581211.

It is a happy number.

11218520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 11218492 and 11218501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140192 + ... + 140271.

It is an arithmetic number, because the mean of its divisors is an integer number (1577610).

Almost surely, 2^11218520 is an apocalyptic number.

11218520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11218520 is an abundant number, since it is smaller than the sum of its proper divisors (14023240).

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

11218520 is a wasteful number, since it uses less digits than its factorization.

11218520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280474 (or 280470 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 11218520 is about 3349.4059174725. The cubic root of 11218520 is about 223.8610426428.

Adding to 11218520 its reverse (2581211), we get a palindrome (13799731).

The spelling of 11218520 in words is "eleven million, two hundred eighteen thousand, five hundred twenty".