42056217 has 12 divisors (see below), whose sum is σ = 69426240. Its totient is φ = 24032088.

The previous prime is 42056207. The next prime is 42056221. The reversal of 42056217 is 71265024.

It is not a de Polignac number, because 42056217 - 2⁷ = 42056089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42056207) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 333717 + ... + 333842.

It is an arithmetic number, because the mean of its divisors is an integer number (5785520).

Almost surely, 2^42056217 is an apocalyptic number.

It is an amenable number.

42056217 is a deficient number, since it is larger than the sum of its proper divisors (27370023).

42056217 is a wasteful number, since it uses less digits than its factorization.

42056217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667572 (or 667569 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 42056217 is about 6485.0764837433. The cubic root of 42056217 is about 347.7576840668.

The spelling of 42056217 in words is "forty-two million, fifty-six thousand, two hundred seventeen".