42278911 has 4 divisors (see below), whose sum is σ = 42369912. Its totient is φ = 42187912.

The previous prime is 42278909. The next prime is 42278939. The reversal of 42278911 is 11987224.

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

It is a cyclic number.

It is not a de Polignac number, because 42278911 - 2¹ = 42278909 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 (42278941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44800 + ... + 45733.

It is an arithmetic number, because the mean of its divisors is an integer number (10592478).

Almost surely, 2^42278911 is an apocalyptic number.

42278911 is a deficient number, since it is larger than the sum of its proper divisors (91001).

42278911 is an equidigital number, since it uses as much as digits as its factorization.

42278911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91000.

The product of its digits is 8064, while the sum is 34.

The square root of 42278911 is about 6502.2235427583. The cubic root of 42278911 is about 348.3704136001.

The spelling of 42278911 in words is "forty-two million, two hundred seventy-eight thousand, nine hundred eleven".