42705686 has 4 divisors (see below), whose sum is σ = 64058532. Its totient is φ = 21352842.

The previous prime is 42705679. The next prime is 42705697. The reversal of 42705686 is 68650724.

It is a happy number.

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 polite number, since it can be written as a sum of consecutive naturals, namely, 10676420 + ... + 10676423.

It is an arithmetic number, because the mean of its divisors is an integer number (16014633).

Almost surely, 2^42705686 is an apocalyptic number.

42705686 is a deficient number, since it is larger than the sum of its proper divisors (21352846).

42705686 is a wasteful number, since it uses less digits than its factorization.

42705686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21352845.

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 42705686 is about 6534.9587603902. The cubic root of 42705686 is about 349.5386738374.

The spelling of 42705686 in words is "forty-two million, seven hundred five thousand, six hundred eighty-six".