42217905 has 32 divisors (see below), whose sum is σ = 72858240. Its totient is φ = 20805120.

The previous prime is 42217883. The next prime is 42217907. The reversal of 42217905 is 50971224.

It is not a de Polignac number, because 42217905 - 2⁶ = 42217841 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42217907) 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, 9879 + ... + 13491.

It is an arithmetic number, because the mean of its divisors is an integer number (2276820).

Almost surely, 2^42217905 is an apocalyptic number.

It is an amenable number.

42217905 is a deficient number, since it is larger than the sum of its proper divisors (30640335).

42217905 is a wasteful number, since it uses less digits than its factorization.

42217905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3681.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 42217905 is about 6497.5306848063. The cubic root of 42217905 is about 348.2027735538.

The spelling of 42217905 in words is "forty-two million, two hundred seventeen thousand, nine hundred five".