42547943 has 4 divisors (see below), whose sum is σ = 42568680. Its totient is φ = 42527208.

The previous prime is 42547937. The next prime is 42547951. The reversal of 42547943 is 34974524.

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 42547943 - 2¹² = 42543847 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42547897 and 42547906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42547913) 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, 6905 + ... + 11522.

It is an arithmetic number, because the mean of its divisors is an integer number (10642170).

Almost surely, 2^42547943 is an apocalyptic number.

42547943 is a deficient number, since it is larger than the sum of its proper divisors (20737).

42547943 is a wasteful number, since it uses less digits than its factorization.

42547943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20736.

The product of its digits is 120960, while the sum is 38.

The square root of 42547943 is about 6522.8784290373. The cubic root of 42547943 is about 349.1077764469.

The spelling of 42547943 in words is "forty-two million, five hundred forty-seven thousand, nine hundred forty-three".