2211540 has 96 divisors (see below), whose sum is σ = 6773760. Its totient is φ = 537600.

The previous prime is 2211493. The next prime is 2211541. The reversal of 2211540 is 451122.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53920 + ... + 53960.

It is an arithmetic number, because the mean of its divisors is an integer number (70560).

2^2211540 is an apocalyptic number.

2211540 is a gapful number since it is divisible by the number (20) 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 2211540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3386880).

2211540 is an abundant number, since it is smaller than the sum of its proper divisors (4562220).

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

2211540 is a wasteful number, since it uses less digits than its factorization.

2211540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113 (or 111 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 2211540 is about 1487.1247425821. The cubic root of 2211540 is about 130.2861546670.

Adding to 2211540 its reverse (451122), we get a palindrome (2662662).

It can be divided in two parts, 22115 and 40, that added together give a triangular number (22155 = T₂₁₀).

The spelling of 2211540 in words is "two million, two hundred eleven thousand, five hundred forty".