42857647 has 4 divisors (see below), whose sum is σ = 48980176. Its totient is φ = 36735120.

The previous prime is 42857641. The next prime is 42857651. The reversal of 42857647 is 74675824.

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 42857647 - 2⁷ = 42857519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42857641) 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, 3061254 + ... + 3061267.

It is an arithmetic number, because the mean of its divisors is an integer number (12245044).

Almost surely, 2^42857647 is an apocalyptic number.

42857647 is a deficient number, since it is larger than the sum of its proper divisors (6122529).

42857647 is an equidigital number, since it uses as much as digits as its factorization.

42857647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6122528.

The product of its digits is 376320, while the sum is 43.

The square root of 42857647 is about 6546.5752115133. The cubic root of 42857647 is about 349.9527745806.

The spelling of 42857647 in words is "forty-two million, eight hundred fifty-seven thousand, six hundred forty-seven".