42840011 has 4 divisors (see below), whose sum is σ = 42853800. Its totient is φ = 42826224.

The previous prime is 42839999. The next prime is 42840067. The reversal of 42840011 is 11004824.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 42840011 - 2⁶ = 42839947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42843011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200 + ... + 9258.

It is an arithmetic number, because the mean of its divisors is an integer number (10713450).

Almost surely, 2^42840011 is an apocalyptic number.

42840011 is a deficient number, since it is larger than the sum of its proper divisors (13789).

42840011 is an equidigital number, since it uses as much as digits as its factorization.

42840011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13788.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 42840011 is about 6545.2281090883. The cubic root of 42840011 is about 349.9047659261.

Adding to 42840011 its reverse (11004824), we get a palindrome (53844835).

The spelling of 42840011 in words is "forty-two million, eight hundred forty thousand, eleven".