1255705905 has 8 divisors (see below), whose sum is σ = 2009129472. Its totient is φ = 669709808.

The previous prime is 1255705897. The next prime is 1255705937. The reversal of 1255705905 is 5095075521.

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 1255705905 - 2³ = 1255705897 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41856849 + ... + 41856878.

It is an arithmetic number, because the mean of its divisors is an integer number (251141184).

Almost surely, 2^1255705905 is an apocalyptic number.

1255705905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1255705905 is a deficient number, since it is larger than the sum of its proper divisors (753423567).

1255705905 is an equidigital number, since it uses as much as digits as its factorization.

1255705905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83713735.

The product of its (nonzero) digits is 78750, while the sum is 39.

The square root of 1255705905 is about 35435.9408651725. The cubic root of 1255705905 is about 1078.8539239818.

The spelling of 1255705905 in words is "one billion, two hundred fifty-five million, seven hundred five thousand, nine hundred five".