2257729 has 4 divisors (see below), whose sum is σ = 2289600. Its totient is φ = 2225860.

The previous prime is 2257721. The next prime is 2257733. The reversal of 2257729 is 9277522.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9277522 = 2 ⋅4638761.

It is a cyclic number.

It is not a de Polignac number, because 2257729 - 2³ = 2257721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2257694 and 2257703.

It is not an unprimeable number, because it can be changed into a prime (2257721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15829 + ... + 15970.

It is an arithmetic number, because the mean of its divisors is an integer number (572400).

2^2257729 is an apocalyptic number.

It is an amenable number.

2257729 is a deficient number, since it is larger than the sum of its proper divisors (31871).

2257729 is an equidigital number, since it uses as much as digits as its factorization.

2257729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31870.

The product of its digits is 17640, while the sum is 34.

The square root of 2257729 is about 1502.5741246275. The cubic root of 2257729 is about 131.1869405316.

The spelling of 2257729 in words is "two million, two hundred fifty-seven thousand, seven hundred twenty-nine".