42371891 has 4 divisors (see below), whose sum is σ = 42453432. Its totient is φ = 42290352.

The previous prime is 42371873. The next prime is 42371941. The reversal of 42371891 is 19817324.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42371891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42371801) 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, 39986 + ... + 41031.

It is an arithmetic number, because the mean of its divisors is an integer number (10613358).

Almost surely, 2^42371891 is an apocalyptic number.

42371891 is a deficient number, since it is larger than the sum of its proper divisors (81541).

42371891 is an equidigital number, since it uses as much as digits as its factorization.

42371891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81540.

The product of its digits is 12096, while the sum is 35.

The square root of 42371891 is about 6509.3694779141. The cubic root of 42371891 is about 348.6256059571.

The spelling of 42371891 in words is "forty-two million, three hundred seventy-one thousand, eight hundred ninety-one".