42420505 has 16 divisors (see below), whose sum is σ = 51819264. Its totient is φ = 33332800.

The previous prime is 42420503. The next prime is 42420509. The reversal of 42420505 is 50502424.

It is not a de Polignac number, because 42420505 - 2¹ = 42420503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42420503) 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, 84084 + ... + 84586.

It is an arithmetic number, because the mean of its divisors is an integer number (3238704).

Almost surely, 2^42420505 is an apocalyptic number.

It is an amenable number.

42420505 is a deficient number, since it is larger than the sum of its proper divisors (9398759).

42420505 is a wasteful number, since it uses less digits than its factorization.

42420505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776.

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 42420505 is about 6513.1025632950. The cubic root of 42420505 is about 348.7588830529.

Adding to 42420505 its reverse (50502424), we get a palindrome (92922929).

The spelling of 42420505 in words is "forty-two million, four hundred twenty thousand, five hundred five".