1255805 has 8 divisors (see below), whose sum is σ = 1586400. Its totient is φ = 951696.

The previous prime is 1255801. The next prime is 1255811. The reversal of 1255805 is 5085521.

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 1255805 - 2² = 1255801 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255801) 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, 6515 + ... + 6704.

It is an arithmetic number, because the mean of its divisors is an integer number (198300).

2^1255805 is an apocalyptic number.

It is an amenable number.

1255805 is a deficient number, since it is larger than the sum of its proper divisors (330595).

1255805 is a wasteful number, since it uses less digits than its factorization.

1255805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13243.

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 1255805 is about 1120.6270566071. The cubic root of 1255805 is about 107.8882302765. Note that the first 3 decimals are identical.

The spelling of 1255805 in words is "one million, two hundred fifty-five thousand, eight hundred five".