1256859872 has 12 divisors (see below), whose sum is σ = 2474442936. Its totient is φ = 628429920.

The previous prime is 1256859833. The next prime is 1256859941. The reversal of 1256859872 is 2789586521.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19638404 + ... + 19638467.

It is an arithmetic number, because the mean of its divisors is an integer number (206203578).

Almost surely, 2^1256859872 is an apocalyptic number.

It is an amenable number.

1256859872 is a deficient number, since it is larger than the sum of its proper divisors (1217583064).

1256859872 is an equidigital number, since it uses as much as digits as its factorization.

1256859872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39276881 (or 39276873 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 53.

The square root of 1256859872 is about 35452.2195638016. The cubic root of 1256859872 is about 1079.1843040629.

The spelling of 1256859872 in words is "one billion, two hundred fifty-six million, eight hundred fifty-nine thousand, eight hundred seventy-two".