1285657 has 8 divisors (see below), whose sum is σ = 1362240. Its totient is φ = 1211280.

The previous prime is 1285649. The next prime is 1285679. The reversal of 1285657 is 7565821.

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 1285657 - 2³ = 1285649 is a prime.

1285657 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1285607) 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 7 ways as a sum of consecutive naturals, for example, 732 + ... + 1762.

It is an arithmetic number, because the mean of its divisors is an integer number (170280).

2^1285657 is an apocalyptic number.

It is an amenable number.

1285657 is a deficient number, since it is larger than the sum of its proper divisors (76583).

1285657 is a wasteful number, since it uses less digits than its factorization.

1285657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103.

The product of its digits is 16800, while the sum is 34.

The square root of 1285657 is about 1133.8681581207. The cubic root of 1285657 is about 108.7364223151.

The spelling of 1285657 in words is "one million, two hundred eighty-five thousand, six hundred fifty-seven".