42842647 has 2 divisors, whose sum is σ = 42842648. Its totient is φ = 42842646.

The previous prime is 42842627. The next prime is 42842687. The reversal of 42842647 is 74624824.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42842647 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42842617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21421323 + 21421324.

It is an arithmetic number, because the mean of its divisors is an integer number (21421324).

Almost surely, 2^42842647 is an apocalyptic number.

42842647 is a deficient number, since it is larger than the sum of its proper divisors (1).

42842647 is an equidigital number, since it uses as much as digits as its factorization.

42842647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86016, while the sum is 37.

The square root of 42842647 is about 6545.4294740681. The cubic root of 42842647 is about 349.9119424731.

The spelling of 42842647 in words is "forty-two million, eight hundred forty-two thousand, six hundred forty-seven".