853404409 has 12 divisors (see below), whose sum is σ = 1010198308. Its totient is φ = 716142240.

The previous prime is 853404407. The next prime is 853404413. The reversal of 853404409 is 904404358.

It can be written as a sum of positive squares in 2 ways, for example, as 333427600 + 519976809 = 18260^2 + 22803^2 .

It is not a de Polignac number, because 853404409 - 2¹ = 853404407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (853404407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 269694 + ... + 272839.

Almost surely, 2^853404409 is an apocalyptic number.

It is an amenable number.

853404409 is a deficient number, since it is larger than the sum of its proper divisors (156793899).

853404409 is a wasteful number, since it uses less digits than its factorization.

853404409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542568 (or 542557 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 853404409 is about 29213.0862628378. The cubic root of 853404409 is about 948.5312146915.

The spelling of 853404409 in words is "eight hundred fifty-three million, four hundred four thousand, four hundred nine".