1257985 has 8 divisors (see below), whose sum is σ = 1575360. Its totient is φ = 962544.

The previous prime is 1257973. The next prime is 1257989. The reversal of 1257985 is 5897521.

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 1257985 - 2⁵ = 1257953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1257989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5355 + ... + 5584.

It is an arithmetic number, because the mean of its divisors is an integer number (196920).

2^1257985 is an apocalyptic number.

It is an amenable number.

1257985 is a deficient number, since it is larger than the sum of its proper divisors (317375).

1257985 is a wasteful number, since it uses less digits than its factorization.

1257985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10967.

The product of its digits is 25200, while the sum is 37.

The square root of 1257985 is about 1121.5993045647. The cubic root of 1257985 is about 107.9506232907.

The spelling of 1257985 in words is "one million, two hundred fifty-seven thousand, nine hundred eighty-five".