2721609 has 24 divisors (see below), whose sum is σ = 4410432. Its totient is φ = 1602720.

The previous prime is 2721577. The next prime is 2721619. The reversal of 2721609 is 9061272.

It is not a de Polignac number, because 2721609 - 2⁵ = 2721577 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2721619) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3292 + ... + 4034.

It is an arithmetic number, because the mean of its divisors is an integer number (183768).

2^2721609 is an apocalyptic number.

It is an amenable number.

2721609 is a deficient number, since it is larger than the sum of its proper divisors (1688823).

2721609 is a wasteful number, since it uses less digits than its factorization.

2721609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797 (or 794 counting only the distinct ones).

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

The square root of 2721609 is about 1649.7299779055. The cubic root of 2721609 is about 139.6181601868.

It can be divided in two parts, 272 and 1609, that added together give a palindrome (1881).

The spelling of 2721609 in words is "two million, seven hundred twenty-one thousand, six hundred nine".