42170505 has 16 divisors (see below), whose sum is σ = 72663360. Its totient is φ = 20760768.

The previous prime is 42170501. The next prime is 42170507. The reversal of 42170505 is 50507124.

It is not a de Polignac number, because 42170505 - 2² = 42170501 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42170501) 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 15 ways as a sum of consecutive naturals, for example, 107935 + ... + 108324.

It is an arithmetic number, because the mean of its divisors is an integer number (4541460).

Almost surely, 2^42170505 is an apocalyptic number.

It is an amenable number.

42170505 is a deficient number, since it is larger than the sum of its proper divisors (30492855).

42170505 is a wasteful number, since it uses less digits than its factorization.

42170505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216280.

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 42170505 is about 6493.8821208889. The cubic root of 42170505 is about 348.0724102856.

Adding to 42170505 its reverse (50507124), we get a palindrome (92677629).

The spelling of 42170505 in words is "forty-two million, one hundred seventy thousand, five hundred five".