855399 has 16 divisors (see below), whose sum is σ = 1232000. Its totient is φ = 526176.

The previous prime is 855397. The next prime is 855401. The reversal of 855399 is 993558.

It is an interprime number because it is at equal distance from previous prime (855397) and next prime (855401).

It is not a de Polignac number, because 855399 - 2¹ = 855397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855391) 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 in 15 ways as a sum of consecutive naturals, for example, 2277 + ... + 2625.

It is an arithmetic number, because the mean of its divisors is an integer number (77000).

2⁸⁵⁵³⁹⁹ is an apocalyptic number.

855399 is a deficient number, since it is larger than the sum of its proper divisors (376601).

855399 is a wasteful number, since it uses less digits than its factorization.

855399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414.

The product of its digits is 48600, while the sum is 39.

The square root of 855399 is about 924.8778297700. The cubic root of 855399 is about 94.9269614042.

The spelling of 855399 in words is "eight hundred fifty-five thousand, three hundred ninety-nine".