256818983 has 12 divisors (see below), whose sum is σ = 282231240. Its totient is φ = 233369472.

The previous prime is 256818971. The next prime is 256819001. The reversal of 256818983 is 389818652.

It is not a de Polignac number, because 256818983 - 2¹⁴ = 256802599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256818923) 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 11 ways as a sum of consecutive naturals, for example, 6941 + ... + 23702.

It is an arithmetic number, because the mean of its divisors is an integer number (23519270).

Almost surely, 2^256818983 is an apocalyptic number.

256818983 is a deficient number, since it is larger than the sum of its proper divisors (25412257).

256818983 is a wasteful number, since it uses less digits than its factorization.

256818983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30706 (or 30689 counting only the distinct ones).

The product of its digits is 829440, while the sum is 50.

The square root of 256818983 is about 16025.5727822752. The cubic root of 256818983 is about 635.6368117128.

The spelling of 256818983 in words is "two hundred fifty-six million, eight hundred eighteen thousand, nine hundred eighty-three".