2721906 has 48 divisors (see below), whose sum is σ = 6570720. Its totient is φ = 807360.

The previous prime is 2721899. The next prime is 2721913. The reversal of 2721906 is 6091272.

It is an interprime number because it is at equal distance from previous prime (2721899) and next prime (2721913).

It is a self number, because there is not a number n which added to its sum of digits gives 2721906.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11566 + ... + 11798.

It is an arithmetic number, because the mean of its divisors is an integer number (136890).

2^2721906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2721906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3285360).

2721906 is an abundant number, since it is smaller than the sum of its proper divisors (3848814).

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

2721906 is a wasteful number, since it uses less digits than its factorization.

2721906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311 (or 308 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 2721906 is about 1649.8199901807. The cubic root of 2721906 is about 139.6232386882.

The spelling of 2721906 in words is "two million, seven hundred twenty-one thousand, nine hundred six".