42806866 has 4 divisors (see below), whose sum is σ = 64210302. Its totient is φ = 21403432.

The previous prime is 42806849. The next prime is 42806873. The reversal of 42806866 is 66860824.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 26574025 + 16232841 = 5155^2 + 4029^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10701715 + ... + 10701718.

Almost surely, 2^42806866 is an apocalyptic number.

42806866 is a deficient number, since it is larger than the sum of its proper divisors (21403436).

42806866 is a wasteful number, since it uses less digits than its factorization.

42806866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21403435.

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 42806866 is about 6542.6956218366. The cubic root of 42806866 is about 349.8145030662.

The spelling of 42806866 in words is "forty-two million, eight hundred six thousand, eight hundred sixty-six".