1257085 has 4 divisors (see below), whose sum is σ = 1508508. Its totient is φ = 1005664.

The previous prime is 1257079. The next prime is 1257089. The reversal of 1257085 is 5807521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 700569 + 556516 = 837^2 + 746^2 .

It is a cyclic number.

It is not a de Polignac number, because 1257085 - 2³ = 1257077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125704 + ... + 125713.

It is an arithmetic number, because the mean of its divisors is an integer number (377127).

2^1257085 is an apocalyptic number.

It is an amenable number.

1257085 is a deficient number, since it is larger than the sum of its proper divisors (251423).

1257085 is an equidigital number, since it uses as much as digits as its factorization.

1257085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251422.

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 1257085 is about 1121.1980199768. The cubic root of 1257085 is about 107.9248734502.

The spelling of 1257085 in words is "one million, two hundred fifty-seven thousand, eighty-five".