42057647 has 4 divisors (see below), whose sum is σ = 42360360. Its totient is φ = 41754936.

The previous prime is 42057629. The next prime is 42057671. The reversal of 42057647 is 74675024.

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 42057647 - 2¹² = 42053551 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 (42057247) 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, 151148 + ... + 151425.

It is an arithmetic number, because the mean of its divisors is an integer number (10590090).

Almost surely, 2^42057647 is an apocalyptic number.

42057647 is a deficient number, since it is larger than the sum of its proper divisors (302713).

42057647 is a wasteful number, since it uses less digits than its factorization.

42057647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302712.

The product of its (nonzero) digits is 47040, while the sum is 35.

The square root of 42057647 is about 6485.1867359391. The cubic root of 42057647 is about 347.7616255201.

The spelling of 42057647 in words is "forty-two million, fifty-seven thousand, six hundred forty-seven".