1256381875 has 20 divisors (see below), whose sum is σ = 1794263152. Its totient is φ = 861516000.

The previous prime is 1256381839. The next prime is 1256381887. The reversal of 1256381875 is 5781836521.

It is not a de Polignac number, because 1256381875 - 2⁷ = 1256381747 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 139212 + ... + 147961.

Almost surely, 2^1256381875 is an apocalyptic number.

1256381875 is a deficient number, since it is larger than the sum of its proper divisors (537881277).

1256381875 is an frugal number, since it uses more digits than its factorization.

1256381875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287200 (or 287185 counting only the distinct ones).

The product of its digits is 403200, while the sum is 46.

The square root of 1256381875 is about 35445.4774971364. The cubic root of 1256381875 is about 1079.0474783437.

The spelling of 1256381875 in words is "one billion, two hundred fifty-six million, three hundred eighty-one thousand, eight hundred seventy-five".