855381 has 8 divisors (see below), whose sum is σ = 1146240. Its totient is φ = 567392.

The previous prime is 855377. The next prime is 855391. The reversal of 855381 is 183558.

It is a happy number.

855381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 855381 - 2² = 855377 is a prime.

It is a super-2 number, since 2×855381² = 1463353310322, which contains 22 as substring.

855381 is a lucky number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 121 + ... + 1313.

It is an arithmetic number, because the mean of its divisors is an integer number (143280).

2⁸⁵⁵³⁸¹ is an apocalyptic number.

It is an amenable number.

855381 is a deficient number, since it is larger than the sum of its proper divisors (290859).

855381 is a wasteful number, since it uses less digits than its factorization.

855381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1435.

The product of its digits is 4800, while the sum is 30.

The square root of 855381 is about 924.8680987038. The cubic root of 855381 is about 94.9262955561.

The spelling of 855381 in words is "eight hundred fifty-five thousand, three hundred eighty-one".