42538816 has 14 divisors (see below), whose sum is σ = 84413090. Its totient is φ = 21269376.

The previous prime is 42538759. The next prime is 42538817. The reversal of 42538816 is 61883524.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 34105600 + 8433216 = 5840^2 + 2904^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42538817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332271 + ... + 332398.

Almost surely, 2^42538816 is an apocalyptic number.

It is an amenable number.

42538816 is a deficient number, since it is larger than the sum of its proper divisors (41874274).

42538816 is an equidigital number, since it uses as much as digits as its factorization.

42538816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664681 (or 664671 counting only the distinct ones).

The product of its digits is 46080, while the sum is 37.

The square root of 42538816 is about 6522.1787770652. The cubic root of 42538816 is about 349.0828121807.

The spelling of 42538816 in words is "forty-two million, five hundred thirty-eight thousand, eight hundred sixteen".