42011806 has 4 divisors (see below), whose sum is σ = 63017712. Its totient is φ = 21005902.

The previous prime is 42011803. The next prime is 42011813. The reversal of 42011806 is 60811024.

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

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42011803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10502950 + ... + 10502953.

It is an arithmetic number, because the mean of its divisors is an integer number (15754428).

Almost surely, 2^42011806 is an apocalyptic number.

42011806 is a deficient number, since it is larger than the sum of its proper divisors (21005906).

42011806 is a wasteful number, since it uses less digits than its factorization.

42011806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21005905.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 42011806 is about 6481.6514870826. The cubic root of 42011806 is about 347.6352312553.

The spelling of 42011806 in words is "forty-two million, eleven thousand, eight hundred six".