42040816 has 20 divisors (see below), whose sum is σ = 81998224. Its totient is φ = 20880000.

The previous prime is 42040777. The next prime is 42040829. The reversal of 42040816 is 61804024.

42040816 = T₁₈₄ + T₁₈₅ + ... + T₆₃₆.

42040816 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 6285 + ... + 11116.

Almost surely, 2^42040816 is an apocalyptic number.

It is an amenable number.

42040816 is a deficient number, since it is larger than the sum of its proper divisors (39957408).

42040816 is a wasteful number, since it uses less digits than its factorization.

42040816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17560 (or 17554 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 42040816 is about 6483.8889564828. Note that the first 3 decimals coincide. The cubic root of 42040816 is about 347.7152292260.

The spelling of 42040816 in words is "forty-two million, forty thousand, eight hundred sixteen".