42187799 has 4 divisors (see below), whose sum is σ = 42259536. Its totient is φ = 42116064.

The previous prime is 42187787. The next prime is 42187813. The reversal of 42187799 is 99778124.

42187799 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-42187799 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 (42187709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34979 + ... + 36164.

It is an arithmetic number, because the mean of its divisors is an integer number (10564884).

Almost surely, 2^42187799 is an apocalyptic number.

42187799 is a deficient number, since it is larger than the sum of its proper divisors (71737).

42187799 is an equidigital number, since it uses as much as digits as its factorization.

42187799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71736.

The product of its digits is 254016, while the sum is 47.

The square root of 42187799 is about 6495.2135453732. The cubic root of 42187799 is about 348.1199849398.

The spelling of 42187799 in words is "forty-two million, one hundred eighty-seven thousand, seven hundred ninety-nine".