42049871 has 4 divisors (see below), whose sum is σ = 43186392. Its totient is φ = 40913352.

The previous prime is 42049867. The next prime is 42049873. The reversal of 42049871 is 17894024.

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 42049871 - 2² = 42049867 is a prime.

It is a super-2 number, since 2×42049871² = 3536383302233282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42049873) 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 3 ways as a sum of consecutive naturals, for example, 568205 + ... + 568278.

It is an arithmetic number, because the mean of its divisors is an integer number (10796598).

Almost surely, 2^42049871 is an apocalyptic number.

42049871 is a deficient number, since it is larger than the sum of its proper divisors (1136521).

42049871 is a wasteful number, since it uses less digits than its factorization.

42049871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136520.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 42049871 is about 6484.5871880946. The cubic root of 42049871 is about 347.7401917558.

The spelling of 42049871 in words is "forty-two million, forty-nine thousand, eight hundred seventy-one".