2811240 has 128 divisors (see below), whose sum is σ = 9936000. Its totient is φ = 705024.

The previous prime is 2811229. The next prime is 2811241. The reversal of 2811240 is 421182.

2811240 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 (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2811241) 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 31 ways as a sum of consecutive naturals, for example, 20452 + ... + 20588.

It is an arithmetic number, because the mean of its divisors is an integer number (77625).

2^2811240 is an apocalyptic number.

2811240 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 2811240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4968000).

2811240 is an abundant number, since it is smaller than the sum of its proper divisors (7124760).

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

2811240 is a wasteful number, since it uses less digits than its factorization.

2811240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176 (or 166 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 2811240 is about 1676.6752816213. The cubic root of 2811240 is about 141.1343219765.

It can be divided in two parts, 281 and 1240, that added together give a square (1521 = 39²).

The spelling of 2811240 in words is "two million, eight hundred eleven thousand, two hundred forty".