42806861 has 4 divisors (see below), whose sum is σ = 43348800.
Its totient is φ = 42264924.
The previous prime is 42806849. The next prime is 42806873. The reversal of 42806861 is 16860824.
42806861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is an interprime number because it is at equal distance from previous prime (42806849) and next prime (42806873).
It is a cyclic number.
It is not a de Polignac number, because 42806861 - 210 = 42805837 is a prime.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (42806831) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270851 + ... + 271008.
It is an arithmetic number, because the mean of its divisors is an integer number (10837200).
Almost surely, 242806861 is an apocalyptic number.
It is an amenable number.
42806861 is a deficient number, since it is larger than the sum of its proper divisors (541939).
42806861 is an equidigital number, since it uses as much as digits as its factorization.
42806861 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 541938.
The product of its (nonzero) digits is 18432, while the sum is 35.
The square root of 42806861 is about 6542.6952397311.
The cubic root of 42806861 is about 349.8144894463.
The spelling of 42806861 in words is "forty-two million, eight hundred six thousand, eight hundred sixty-one".