853869 has 4 divisors (see below), whose sum is σ = 1138496. Its totient is φ = 569244.

The previous prime is 853843. The next prime is 853873. The reversal of 853869 is 968358.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 853869 - 2⁵ = 853837 is a prime.

It is a super-2 number, since 2×853869² = 1458184538322, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

853869 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (853819) 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 3 ways as a sum of consecutive naturals, for example, 142309 + ... + 142314.

It is an arithmetic number, because the mean of its divisors is an integer number (284624).

2⁸⁵³⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

853869 is a deficient number, since it is larger than the sum of its proper divisors (284627).

853869 is a wasteful number, since it uses less digits than its factorization.

853869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284626.

The product of its digits is 51840, while the sum is 39.

The square root of 853869 is about 924.0503233050. The cubic root of 853869 is about 94.8703309389.

The spelling of 853869 in words is "eight hundred fifty-three thousand, eight hundred sixty-nine".