42909816 has 32 divisors (see below), whose sum is σ = 107452800. Its totient is φ = 14279520.

The previous prime is 42909803. The next prime is 42909817. The reversal of 42909816 is 61890924.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42909817) 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 7 ways as a sum of consecutive naturals, for example, 19071 + ... + 21201.

It is an arithmetic number, because the mean of its divisors is an integer number (3357900).

Almost surely, 2^42909816 is an apocalyptic number.

It is an amenable number.

42909816 is an abundant number, since it is smaller than the sum of its proper divisors (64542984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42909816 is a wasteful number, since it uses less digits than its factorization.

42909816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2979 (or 2975 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 42909816 is about 6550.5584494759. The cubic root of 42909816 is about 350.0947117832.

The spelling of 42909816 in words is "forty-two million, nine hundred nine thousand, eight hundred sixteen".