11215720 has 64 divisors (see below), whose sum is σ = 26853120. Its totient is φ = 4207104.

The previous prime is 11215717. The next prime is 11215727. The reversal of 11215720 is 2751211.

It is not an unprimeable number, because it can be changed into a prime (11215727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67077 + ... + 67243.

It is an arithmetic number, because the mean of its divisors is an integer number (419580).

Almost surely, 2^11215720 is an apocalyptic number.

11215720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11215720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13426560).

11215720 is an abundant number, since it is smaller than the sum of its proper divisors (15637400).

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

11215720 is a wasteful number, since it uses less digits than its factorization.

11215720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274 (or 270 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 19.

The square root of 11215720 is about 3348.9879068160. The cubic root of 11215720 is about 223.8424168028.

Adding to 11215720 its reverse (2751211), we get a palindrome (13966931).

It can be divided in two parts, 11215 and 720, that added together give a triangular number (11935 = T₁₅₄).

The spelling of 11215720 in words is "eleven million, two hundred fifteen thousand, seven hundred twenty".