856545 has 16 divisors (see below), whose sum is σ = 1451520. Its totient is φ = 429824.

The previous prime is 856529. The next prime is 856547. The reversal of 856545 is 545658.

It is a cyclic number.

It is not a de Polignac number, because 856545 - 2⁴ = 856529 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (856547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1425 + ... + 1934.

It is an arithmetic number, because the mean of its divisors is an integer number (90720).

2⁸⁵⁶⁵⁴⁵ is an apocalyptic number.

856545 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

856545 is a deficient number, since it is larger than the sum of its proper divisors (594975).

856545 is a wasteful number, since it uses less digits than its factorization.

856545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3384.

The product of its digits is 24000, while the sum is 33.

The square root of 856545 is about 925.4971636910. The cubic root of 856545 is about 94.9693345161.

The spelling of 856545 in words is "eight hundred fifty-six thousand, five hundred forty-five".