42668813 has 16 divisors (see below), whose sum is σ = 49473600. Its totient is φ = 36391680.

The previous prime is 42668797. The next prime is 42668819. The reversal of 42668813 is 31886624.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 42668813 - 2⁴ = 42668797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42668819) 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 15 ways as a sum of consecutive naturals, for example, 21845 + ... + 23717.

It is an arithmetic number, because the mean of its divisors is an integer number (3092100).

Almost surely, 2^42668813 is an apocalyptic number.

It is an amenable number.

42668813 is a deficient number, since it is larger than the sum of its proper divisors (6804787).

42668813 is a wasteful number, since it uses less digits than its factorization.

42668813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2012.

The product of its digits is 55296, while the sum is 38.

The square root of 42668813 is about 6532.1369397771. The cubic root of 42668813 is about 349.4380451552.

The spelling of 42668813 in words is "forty-two million, six hundred sixty-eight thousand, eight hundred thirteen".