856507 has 2 divisors, whose sum is σ = 856508. Its totient is φ = 856506.

The previous prime is 856487. The next prime is 856519. The reversal of 856507 is 705658.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 856507 - 2¹¹ = 854459 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (856547) 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, 428253 + 428254.

It is an arithmetic number, because the mean of its divisors is an integer number (428254).

2⁸⁵⁶⁵⁰⁷ is an apocalyptic number.

856507 is a deficient number, since it is larger than the sum of its proper divisors (1).

856507 is an equidigital number, since it uses as much as digits as its factorization.

856507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 856507 is about 925.4766339568. The cubic root of 856507 is about 94.9679300800.

The spelling of 856507 in words is "eight hundred fifty-six thousand, five hundred seven".