1257005 has 8 divisors (see below), whose sum is σ = 1560600. Its totient is φ = 970816.

The previous prime is 1256993. The next prime is 1257013. The reversal of 1257005 is 5007521.

It can be written as a sum of positive squares in 4 ways, for example, as 114244 + 1142761 = 338^2 + 1069^2 .

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 1257005 - 2⁴ = 1256989 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 4190 + ... + 4479.

It is an arithmetic number, because the mean of its divisors is an integer number (195075).

2^1257005 is an apocalyptic number.

It is an amenable number.

1257005 is a deficient number, since it is larger than the sum of its proper divisors (303595).

1257005 is an equidigital number, since it uses as much as digits as its factorization.

1257005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8703.

The product of its (nonzero) digits is 350, while the sum is 20.

The square root of 1257005 is about 1121.1623432849. The cubic root of 1257005 is about 107.9225839807.

The spelling of 1257005 in words is "one million, two hundred fifty-seven thousand, five".