1256847005 has 16 divisors (see below), whose sum is σ = 1563637824. Its totient is φ = 969121920.

The previous prime is 1256846971. The next prime is 1256847013. The reversal of 1256847005 is 5007486521.

It is not a de Polignac number, because 1256847005 - 2¹⁶ = 1256781469 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1256847005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19919 + ... + 53948.

It is an arithmetic number, because the mean of its divisors is an integer number (97727364).

Almost surely, 2^1256847005 is an apocalyptic number.

It is an amenable number.

1256847005 is a deficient number, since it is larger than the sum of its proper divisors (306790819).

1256847005 is an equidigital number, since it uses as much as digits as its factorization.

1256847005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73996.

The product of its (nonzero) digits is 67200, while the sum is 38.

The square root of 1256847005 is about 35452.0380937401. The cubic root of 1256847005 is about 1079.1806213633.

The spelling of 1256847005 in words is "one billion, two hundred fifty-six million, eight hundred forty-seven thousand, five".