10257209 has 4 divisors (see below), whose sum is σ = 10431120. Its totient is φ = 10083300.

The previous prime is 10257197. The next prime is 10257229. The reversal of 10257209 is 90275201.

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 a de Polignac number, because none of the positive numbers 2^k-10257209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10257229) 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, 86867 + ... + 86984.

It is an arithmetic number, because the mean of its divisors is an integer number (2607780).

Almost surely, 2^10257209 is an apocalyptic number.

It is an amenable number.

10257209 is a deficient number, since it is larger than the sum of its proper divisors (173911).

10257209 is an equidigital number, since it uses as much as digits as its factorization.

10257209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173910.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 10257209 is about 3202.6877774769. The cubic root of 10257209 is about 217.2749881541.

The spelling of 10257209 in words is "ten million, two hundred fifty-seven thousand, two hundred nine".