42870647 has 2 divisors, whose sum is σ = 42870648. Its totient is φ = 42870646.

The previous prime is 42870629. The next prime is 42870649. The reversal of 42870647 is 74607824.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42870647 - 2¹⁰ = 42869623 is a prime.

Together with 42870649, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42870647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42870649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21435323 + 21435324.

It is an arithmetic number, because the mean of its divisors is an integer number (21435324).

Almost surely, 2^42870647 is an apocalyptic number.

42870647 is a deficient number, since it is larger than the sum of its proper divisors (1).

42870647 is an equidigital number, since it uses as much as digits as its factorization.

42870647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75264, while the sum is 38.

The square root of 42870647 is about 6547.5680217925. The cubic root of 42870647 is about 349.9881547012.

The spelling of 42870647 in words is "forty-two million, eight hundred seventy thousand, six hundred forty-seven".