2209729 has 8 divisors (see below), whose sum is σ = 2273832. Its totient is φ = 2146560.

The previous prime is 2209721. The next prime is 2209741. The reversal of 2209729 is 9279022.

2209729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1311025 + 898704 = 1145^2 + 948^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2209729 - 2³ = 2209721 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2209729.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2209721) 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 7 ways as a sum of consecutive naturals, for example, 9049 + ... + 9289.

It is an arithmetic number, because the mean of its divisors is an integer number (284229).

2^2209729 is an apocalyptic number.

It is an amenable number.

2209729 is a deficient number, since it is larger than the sum of its proper divisors (64103).

2209729 is a wasteful number, since it uses less digits than its factorization.

2209729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 2209729 is about 1486.5157247739. The cubic root of 2209729 is about 130.2505817690.

It can be divided in two parts, 2209 and 729, that multiplied together give a square (1610361 = 1269²).

The spelling of 2209729 in words is "two million, two hundred nine thousand, seven hundred twenty-nine".