853409 has 4 divisors (see below), whose sum is σ = 858516. Its totient is φ = 848304.

The previous prime is 853403. The next prime is 853427. The reversal of 853409 is 904358.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 547600 + 305809 = 740^2 + 553^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-853409 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 853409.

It is not an unprimeable number, because it can be changed into a prime (853403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2294 + ... + 2639.

It is an arithmetic number, because the mean of its divisors is an integer number (214629).

2⁸⁵³⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

853409 is a deficient number, since it is larger than the sum of its proper divisors (5107).

853409 is a wasteful number, since it uses less digits than its factorization.

853409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5106.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 853409 is about 923.8013855803. The cubic root of 853409 is about 94.8532915604.

The spelling of 853409 in words is "eight hundred fifty-three thousand, four hundred nine".