2721306 has 16 divisors (see below), whose sum is σ = 6220224. Its totient is φ = 777504.

The previous prime is 2721259. The next prime is 2721307. The reversal of 2721306 is 6031272.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (2721307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32355 + ... + 32438.

It is an arithmetic number, because the mean of its divisors is an integer number (388764).

2^2721306 is an apocalyptic number.

2721306 is an abundant number, since it is smaller than the sum of its proper divisors (3498918).

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

2721306 is a wasteful number, since it uses less digits than its factorization.

2721306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64805.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 2721306 is about 1649.6381421391. The cubic root of 2721306 is about 139.6129787086.

Adding to 2721306 its reverse (6031272), we get a palindrome (8752578).

The spelling of 2721306 in words is "two million, seven hundred twenty-one thousand, three hundred six".