870643 has 2 divisors, whose sum is σ = 870644. Its totient is φ = 870642.

The previous prime is 870641. The next prime is 870679. The reversal of 870643 is 346078.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 870643 - 2¹ = 870641 is a prime.

Together with 870641, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (870641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435321 + 435322.

It is an arithmetic number, because the mean of its divisors is an integer number (435322).

2⁸⁷⁰⁶⁴³ is an apocalyptic number.

870643 is a deficient number, since it is larger than the sum of its proper divisors (1).

870643 is an equidigital number, since it uses as much as digits as its factorization.

870643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 870643 is about 933.0825258250. The cubic root of 870643 is about 95.4875398343.

The spelling of 870643 in words is "eight hundred seventy thousand, six hundred forty-three".