42866191 has 4 divisors (see below), whose sum is σ = 42939072. Its totient is φ = 42793312.

The previous prime is 42866171. The next prime is 42866221. The reversal of 42866191 is 19166824.

It is a happy number.

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 42866191 - 2¹⁹ = 42341903 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42866191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42866171) 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, 35551 + ... + 36736.

It is an arithmetic number, because the mean of its divisors is an integer number (10734768).

Almost surely, 2^42866191 is an apocalyptic number.

42866191 is a deficient number, since it is larger than the sum of its proper divisors (72881).

42866191 is an equidigital number, since it uses as much as digits as its factorization.

42866191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72880.

The product of its digits is 20736, while the sum is 37.

The square root of 42866191 is about 6547.2277339344. The cubic root of 42866191 is about 349.9760282902.

The spelling of 42866191 in words is "forty-two million, eight hundred sixty-six thousand, one hundred ninety-one".