42256805 has 8 divisors (see below), whose sum is σ = 50802552. Its totient is φ = 33742528.

The previous prime is 42256777. The next prime is 42256811. The reversal of 42256805 is 50865224.

It can be written as a sum of positive squares in 4 ways, for example, as 4532641 + 37724164 = 2129^2 + 6142^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 42256805 - 2²⁰ = 41208229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4802 + ... + 10371.

It is an arithmetic number, because the mean of its divisors is an integer number (6350319).

Almost surely, 2^42256805 is an apocalyptic number.

It is an amenable number.

42256805 is a deficient number, since it is larger than the sum of its proper divisors (8545747).

42256805 is a wasteful number, since it uses less digits than its factorization.

42256805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15735.

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 42256805 is about 6500.5234404623. The cubic root of 42256805 is about 348.3096865633.

The spelling of 42256805 in words is "forty-two million, two hundred fifty-six thousand, eight hundred five".