42405686 has 4 divisors (see below), whose sum is σ = 63608532. Its totient is φ = 21202842.

The previous prime is 42405677. The next prime is 42405691. The reversal of 42405686 is 68650424.

42405686 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 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 as a sum of consecutive naturals, namely, 10601420 + ... + 10601423.

It is an arithmetic number, because the mean of its divisors is an integer number (15902133).

Almost surely, 2^42405686 is an apocalyptic number.

42405686 is a deficient number, since it is larger than the sum of its proper divisors (21202846).

42405686 is a wasteful number, since it uses less digits than its factorization.

42405686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21202845.

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 42405686 is about 6511.9648340574. The cubic root of 42405686 is about 348.7182670047.

The spelling of 42405686 in words is "forty-two million, four hundred five thousand, six hundred eighty-six".