1257285 has 16 divisors (see below), whose sum is σ = 2039040. Its totient is φ = 661440.

The previous prime is 1257281. The next prime is 1257293. The reversal of 1257285 is 5827521.

It is not a de Polignac number, because 1257285 - 2² = 1257281 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257281) 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 15 ways as a sum of consecutive naturals, for example, 655 + ... + 1715.

It is an arithmetic number, because the mean of its divisors is an integer number (127440).

2^1257285 is an apocalyptic number.

1257285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1257285 is a deficient number, since it is larger than the sum of its proper divisors (781755).

1257285 is a wasteful number, since it uses less digits than its factorization.

1257285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148.

The product of its digits is 5600, while the sum is 30.

The square root of 1257285 is about 1121.2872067405. The cubic root of 1257285 is about 107.9305966988.

The spelling of 1257285 in words is "one million, two hundred fifty-seven thousand, two hundred eighty-five".