1256385 has 32 divisors (see below), whose sum is σ = 2298240. Its totient is φ = 580608.

The previous prime is 1256383. The next prime is 1256389. The reversal of 1256385 is 5836521.

It is not a de Polignac number, because 1256385 - 2¹ = 1256383 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1256383) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3126 + ... + 3504.

It is an arithmetic number, because the mean of its divisors is an integer number (71820).

2^1256385 is an apocalyptic number.

1256385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1256385 is a deficient number, since it is larger than the sum of its proper divisors (1041855).

1256385 is a wasteful number, since it uses less digits than its factorization.

1256385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417.

The product of its digits is 7200, while the sum is 30.

The square root of 1256385 is about 1120.8858104196. The cubic root of 1256385 is about 107.9048372982.

The spelling of 1256385 in words is "one million, two hundred fifty-six thousand, three hundred eighty-five".