1256385852 has 36 divisors (see below), whose sum is σ = 3178182280. Its totient is φ = 418489632.

The previous prime is 1256385841. The next prime is 1256385859. The reversal of 1256385852 is 2585836521.

1256385852 is a `hidden beast` number, since 1 + 2 + 5 + 63 + 8 + 585 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 1256385798 and 1256385807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256385859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40299 + ... + 64317.

Almost surely, 2^1256385852 is an apocalyptic number.

1256385852 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1256385852 is an abundant number, since it is smaller than the sum of its proper divisors (1921796428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1256385852 is a wasteful number, since it uses less digits than its factorization.

1256385852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25482 (or 25477 counting only the distinct ones).

The product of its digits is 576000, while the sum is 45.

The square root of 1256385852 is about 35445.5335973378. The cubic root of 1256385852 is about 1079.0486168954.

The spelling of 1256385852 in words is "one billion, two hundred fifty-six million, three hundred eighty-five thousand, eight hundred fifty-two".