256886493 has 8 divisors (see below), whose sum is σ = 342592800. Its totient is φ = 171218928.

The previous prime is 256886459. The next prime is 256886501. The reversal of 256886493 is 394688652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256886493 - 2⁸ = 256886237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256886093) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 14218 + ... + 26756.

It is an arithmetic number, because the mean of its divisors is an integer number (42824100).

Almost surely, 2^256886493 is an apocalyptic number.

It is an amenable number.

256886493 is a deficient number, since it is larger than the sum of its proper divisors (85706307).

256886493 is a wasteful number, since it uses less digits than its factorization.

256886493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19371.

The product of its digits is 2488320, while the sum is 51.

The square root of 256886493 is about 16027.6789648408. The cubic root of 256886493 is about 635.6925034444.

It can be divided in two parts, 25688649 and 3, that added together give a palindrome (25688652).

The spelling of 256886493 in words is "two hundred fifty-six million, eight hundred eighty-six thousand, four hundred ninety-three".