2721312 has 72 divisors (see below), whose sum is σ = 8452080. Its totient is φ = 823680.

The previous prime is 2721307. The next prime is 2721317. The reversal of 2721312 is 2131272.

It is an interprime number because it is at equal distance from previous prime (2721307) and next prime (2721317).

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (2721317) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 2739 + ... + 3597.

It is an arithmetic number, because the mean of its divisors is an integer number (117390).

2^2721312 is an apocalyptic number.

2721312 is a gapful number since it is divisible by the number (22) 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 2721312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4226040).

2721312 is an abundant number, since it is smaller than the sum of its proper divisors (5730768).

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

2721312 is a wasteful number, since it uses less digits than its factorization.

2721312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886 (or 875 counting only the distinct ones).

The product of its digits is 168, while the sum is 18.

The square root of 2721312 is about 1649.6399607187. The cubic root of 2721312 is about 139.6130813159.

Adding to 2721312 its reverse (2131272), we get a palindrome (4852584).

It can be divided in two parts, 27213 and 12, that added together give a square (27225 = 165²).

The spelling of 2721312 in words is "two million, seven hundred twenty-one thousand, three hundred twelve".