256003845 has 16 divisors (see below), whose sum is σ = 414792960. Its totient is φ = 134806464.

The previous prime is 256003841. The next prime is 256003849. The reversal of 256003845 is 548300652.

It is an interprime number because it is at equal distance from previous prime (256003841) and next prime (256003849).

It is not a de Polignac number, because 256003845 - 2² = 256003841 is a prime.

It is a super-3 number, since 3×256003845³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256003841) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 106834 + ... + 109203.

It is an arithmetic number, because the mean of its divisors is an integer number (25924560).

Almost surely, 2^256003845 is an apocalyptic number.

It is an amenable number.

256003845 is a deficient number, since it is larger than the sum of its proper divisors (158789115).

256003845 is a wasteful number, since it uses less digits than its factorization.

256003845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216124.

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 256003845 is about 16000.1201557988. The cubic root of 256003845 is about 634.9635997073.

The spelling of 256003845 in words is "two hundred fifty-six million, three thousand, eight hundred forty-five".