1256885 has 8 divisors (see below), whose sum is σ = 1723776. Its totient is φ = 861840.

The previous prime is 1256873. The next prime is 1256887. The reversal of 1256885 is 5886521.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1256885 - 2⁶ = 1256821 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 35911 = 1256885 / (1 + 2 + 5 + 6 + 8 + 8 + 5).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256887) 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, 17921 + ... + 17990.

It is an arithmetic number, because the mean of its divisors is an integer number (215472).

2^1256885 is an apocalyptic number.

It is an amenable number.

1256885 is a deficient number, since it is larger than the sum of its proper divisors (466891).

1256885 is an equidigital number, since it uses as much as digits as its factorization.

1256885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35923.

The product of its digits is 19200, while the sum is 35.

The square root of 1256885 is about 1121.1088261181. The cubic root of 1256885 is about 107.9191495945.

The spelling of 1256885 in words is "one million, two hundred fifty-six thousand, eight hundred eighty-five".