1255895805 has 16 divisors (see below), whose sum is σ = 2058444864. Its totient is φ = 653473920.

The previous prime is 1255895743. The next prime is 1255895813. The reversal of 1255895805 is 5085985521.

It is not a de Polignac number, because 1255895805 - 2⁷ = 1255895677 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1020439 + ... + 1021668.

It is an arithmetic number, because the mean of its divisors is an integer number (128652804).

Almost surely, 2^1255895805 is an apocalyptic number.

1255895805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1255895805 is a deficient number, since it is larger than the sum of its proper divisors (802549059).

1255895805 is a wasteful number, since it uses less digits than its factorization.

1255895805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2042156.

The product of its (nonzero) digits is 720000, while the sum is 48.

The square root of 1255895805 is about 35438.6202468437. The cubic root of 1255895805 is about 1078.9083061511.

The spelling of 1255895805 in words is "one billion, two hundred fifty-five million, eight hundred ninety-five thousand, eight hundred five".