855321 has 16 divisors (see below), whose sum is σ = 1248768. Its totient is φ = 518400.

The previous prime is 855317. The next prime is 855331. The reversal of 855321 is 123558.

It is not a de Polignac number, because 855321 - 2² = 855317 is a prime.

855321 is a lucky number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 855291 and 855300.

It is not an unprimeable number, because it can be changed into a prime (855311) 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, 1311 + ... + 1851.

It is an arithmetic number, because the mean of its divisors is an integer number (78048).

2⁸⁵⁵³²¹ is an apocalyptic number.

It is an amenable number.

855321 is a deficient number, since it is larger than the sum of its proper divisors (393447).

855321 is a wasteful number, since it uses less digits than its factorization.

855321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592.

The product of its digits is 1200, while the sum is 24.

The square root of 855321 is about 924.8356610771. The cubic root of 855321 is about 94.9240759951.

Adding to 855321 its reverse (123558), we get a palindrome (978879).

It can be divided in two parts, 855 and 321, that added together give a triangular number (1176 = T₄₈).

The spelling of 855321 in words is "eight hundred fifty-five thousand, three hundred twenty-one".