42056866 has 4 divisors (see below), whose sum is σ = 63085302. Its totient is φ = 21028432.

The previous prime is 42056849. The next prime is 42056867. The reversal of 42056866 is 66865024.

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., 33814225 + 8242641 = 5815^2 + 2871^2 .

It is not an unprimeable number, because it can be changed into a prime (42056867) 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 as a sum of consecutive naturals, namely, 10514215 + ... + 10514218.

Almost surely, 2^42056866 is an apocalyptic number.

42056866 is a deficient number, since it is larger than the sum of its proper divisors (21028436).

42056866 is a wasteful number, since it uses less digits than its factorization.

42056866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21028435.

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 42056866 is about 6485.1265215106. The cubic root of 42056866 is about 347.7594728913.

The spelling of 42056866 in words is "forty-two million, fifty-six thousand, eight hundred sixty-six".