42508538 has 4 divisors (see below), whose sum is σ = 63762810. Its totient is φ = 21254268.

The previous prime is 42508537. The next prime is 42508559. The reversal of 42508538 is 83580524.

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., 42471289 + 37249 = 6517^2 + 193^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42508498 and 42508507.

It is not an unprimeable number, because it can be changed into a prime (42508537) 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 as a sum of consecutive naturals, namely, 10627133 + ... + 10627136.

Almost surely, 2^42508538 is an apocalyptic number.

42508538 is a deficient number, since it is larger than the sum of its proper divisors (21254272).

42508538 is a wasteful number, since it uses less digits than its factorization.

42508538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21254271.

The product of its (nonzero) digits is 38400, while the sum is 35.

The square root of 42508538 is about 6519.8572070253. The cubic root of 42508538 is about 348.9999698962. Note that the first 4 decimals are identical.

The spelling of 42508538 in words is "forty-two million, five hundred eight thousand, five hundred thirty-eight".