2721689 has 4 divisors (see below), whose sum is σ = 2734800. Its totient is φ = 2708580.

The previous prime is 2721671. The next prime is 2721701. The reversal of 2721689 is 9861272.

It is a happy number.

2721689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2721689 - 2¹² = 2717593 is a prime.

It is a Duffinian number.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6239 + ... + 6660.

It is an arithmetic number, because the mean of its divisors is an integer number (683700).

2^2721689 is an apocalyptic number.

It is an amenable number.

2721689 is a deficient number, since it is larger than the sum of its proper divisors (13111).

2721689 is a wasteful number, since it uses less digits than its factorization.

2721689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13110.

The product of its digits is 12096, while the sum is 35.

The square root of 2721689 is about 1649.7542241195. The cubic root of 2721689 is about 139.6195281696.

The spelling of 2721689 in words is "two million, seven hundred twenty-one thousand, six hundred eighty-nine".