1285257 has 8 divisors (see below), whose sum is σ = 1721376. Its totient is φ = 852992.

The previous prime is 1285247. The next prime is 1285259. The reversal of 1285257 is 7525821.

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 1285257 - 2⁷ = 1285129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1285259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63 + ... + 1604.

It is an arithmetic number, because the mean of its divisors is an integer number (215172).

2^1285257 is an apocalyptic number.

It is an amenable number.

1285257 is a deficient number, since it is larger than the sum of its proper divisors (436119).

1285257 is a wasteful number, since it uses less digits than its factorization.

1285257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1927.

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

The square root of 1285257 is about 1133.6917570486. The cubic root of 1285257 is about 108.7251442732.

The spelling of 1285257 in words is "one million, two hundred eighty-five thousand, two hundred fifty-seven".