2721606 has 8 divisors (see below), whose sum is σ = 5443224. Its totient is φ = 907200.

The previous prime is 2721577. The next prime is 2721619. The reversal of 2721606 is 6061272.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

2721606 is an admirable number.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226795 + ... + 226806.

It is an arithmetic number, because the mean of its divisors is an integer number (680403).

2^2721606 is an apocalyptic number.

2721606 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2721606 is a wasteful number, since it uses less digits than its factorization.

2721606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453606.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 2721606 is about 1649.7290686655. The cubic root of 2721606 is about 139.6181088869.

Adding to 2721606 its reverse (6061272), we get a palindrome (8782878).

The spelling of 2721606 in words is "two million, seven hundred twenty-one thousand, six hundred six".