42047 has 4 divisors (see below), whose sum is σ = 44280. Its totient is φ = 39816.

The previous prime is 42043. The next prime is 42061. The reversal of 42047 is 74024.

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 42047 - 2² = 42043 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 (42043) 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, 1088 + ... + 1125.

It is an arithmetic number, because the mean of its divisors is an integer number (11070).

2⁴²⁰⁴⁷ is an apocalyptic number.

42047 is a deficient number, since it is larger than the sum of its proper divisors (2233).

42047 is a wasteful number, since it uses less digits than its factorization.

42047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2232.

The product of its (nonzero) digits is 224, while the sum is 17.

The square root of 42047 is about 205.0536515159. The cubic root of 42047 is about 34.7732277464.

The spelling of 42047 in words is "forty-two thousand, forty-seven", and thus it is an iban number.