11211860 has 72 divisors (see below), whose sum is σ = 26745768. Its totient is φ = 3942400.

The previous prime is 11211839. The next prime is 11211869. The reversal of 11211860 is 6811211.

It can be written as a sum of positive squares in 4 ways, for example, as 894916 + 10316944 = 946^2 + 3212^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211869) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99164 + ... + 99276.

It is an arithmetic number, because the mean of its divisors is an integer number (371469).

Almost surely, 2^11211860 is an apocalyptic number.

11211860 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 11211860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13372884).

11211860 is an abundant number, since it is smaller than the sum of its proper divisors (15533908).

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

11211860 is a wasteful number, since it uses less digits than its factorization.

11211860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185 (or 172 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 20.

The square root of 11211860 is about 3348.4115637120. The cubic root of 11211860 is about 223.8167346689.

The spelling of 11211860 in words is "eleven million, two hundred eleven thousand, eight hundred sixty".