855439 has 8 divisors (see below), whose sum is σ = 961632. Its totient is φ = 755040.

The previous prime is 855431. The next prime is 855461. The reversal of 855439 is 934558.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 855439 - 2³ = 855431 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 (855431) 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 7 ways as a sum of consecutive naturals, for example, 1132 + ... + 1729.

It is an arithmetic number, because the mean of its divisors is an integer number (120204).

2⁸⁵⁵⁴³⁹ is an apocalyptic number.

855439 is a deficient number, since it is larger than the sum of its proper divisors (106193).

855439 is a wasteful number, since it uses less digits than its factorization.

855439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2897.

The product of its digits is 21600, while the sum is 34.

The square root of 855439 is about 924.8994539949. The cubic root of 855439 is about 94.9284410331.

The spelling of 855439 in words is "eight hundred fifty-five thousand, four hundred thirty-nine".