256143845 has 32 divisors (see below), whose sum is σ = 344736000. Its totient is φ = 181564416.

The previous prime is 256143841. The next prime is 256143857. The reversal of 256143845 is 548341652.

It is not a de Polignac number, because 256143845 - 2² = 256143841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256143799 and 256143808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256143841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 320987 + ... + 321783.

It is an arithmetic number, because the mean of its divisors is an integer number (10773000).

Almost surely, 2^256143845 is an apocalyptic number.

It is an amenable number.

256143845 is a deficient number, since it is larger than the sum of its proper divisors (88592155).

256143845 is a wasteful number, since it uses less digits than its factorization.

256143845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037.

The product of its digits is 115200, while the sum is 38.

The square root of 256143845 is about 16004.4945249764. The cubic root of 256143845 is about 635.0793254488.

The spelling of 256143845 in words is "two hundred fifty-six million, one hundred forty-three thousand, eight hundred forty-five".