11215872 has 66 divisors (see below), whose sum is σ = 32412198. Its totient is φ = 3735552.

The previous prime is 11215829. The next prime is 11215889. The reversal of 11215872 is 27851211.

It can be written as a sum of positive squares in only one way, i.e., 8856576 + 2359296 = 2976^2 + 1536^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8608 + ... + 9824.

Almost surely, 2^11215872 is an apocalyptic number.

11215872 is a gapful number since it is divisible by the number (12) 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 11215872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16206099).

11215872 is an abundant number, since it is smaller than the sum of its proper divisors (21196326).

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

11215872 is a wasteful number, since it uses less digits than its factorization.

11215872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243 (or 1222 counting only the distinct ones).

The product of its digits is 1120, while the sum is 27.

The square root of 11215872 is about 3349.0106001624. The cubic root of 11215872 is about 223.8434279994.

The spelling of 11215872 in words is "eleven million, two hundred fifteen thousand, eight hundred seventy-two".