42218891 has 8 divisors (see below), whose sum is σ = 49599984. Its totient is φ = 35428320.

The previous prime is 42218881. The next prime is 42218903. The reversal of 42218891 is 19881224.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42218891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42218881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147476 + ... + 147761.

It is an arithmetic number, because the mean of its divisors is an integer number (6199998).

Almost surely, 2^42218891 is an apocalyptic number.

42218891 is a deficient number, since it is larger than the sum of its proper divisors (7381093).

42218891 is a wasteful number, since it uses less digits than its factorization.

42218891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295261.

The product of its digits is 9216, while the sum is 35.

The square root of 42218891 is about 6497.6065593417. The cubic root of 42218891 is about 348.2054842936.

The spelling of 42218891 in words is "forty-two million, two hundred eighteen thousand, eight hundred ninety-one".