42506218 has 4 divisors (see below), whose sum is σ = 63759330. Its totient is φ = 21253108.

The previous prime is 42506197. The next prime is 42506237. The reversal of 42506218 is 81260524.

42506218 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 35605089 + 6901129 = 5967^2 + 2627^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10626553 + ... + 10626556.

Almost surely, 2^42506218 is an apocalyptic number.

42506218 is a deficient number, since it is larger than the sum of its proper divisors (21253112).

42506218 is a wasteful number, since it uses less digits than its factorization.

42506218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21253111.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 42506218 is about 6519.6792865907. The cubic root of 42506218 is about 348.9936206254.

It can be divided in two parts, 42506 and 218, that added together give a palindrome (42724).

The spelling of 42506218 in words is "forty-two million, five hundred six thousand, two hundred eighteen".