851385 has 16 divisors (see below), whose sum is σ = 1373760. Its totient is φ = 450240.

The previous prime is 851381. The next prime is 851387. The reversal of 851385 is 583158.

It is a happy number.

It is not a de Polignac number, because 851385 - 2² = 851381 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (851381) 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, 3031 + ... + 3299.

It is an arithmetic number, because the mean of its divisors is an integer number (85860).

2⁸⁵¹³⁸⁵ is an apocalyptic number.

It is an amenable number.

851385 is a deficient number, since it is larger than the sum of its proper divisors (522375).

851385 is a wasteful number, since it uses less digits than its factorization.

851385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488.

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

The square root of 851385 is about 922.7052617169. The cubic root of 851385 is about 94.7782454666.

The spelling of 851385 in words is "eight hundred fifty-one thousand, three hundred eighty-five".