849897409 has 3 divisors (see below), whose sum is σ = 849926563. Its totient is φ = 849868256.

The previous prime is 849897407. The next prime is 849897427. The reversal of 849897409 is 904798948.

The square root of 849897409 is 29153.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 13068225 + 836829184 = 3615^2 + 28928^2 .

It is not a de Polignac number, because 849897409 - 2¹ = 849897407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (849897407) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 14577 + ... + 43729.

Almost surely, 2^849897409 is an apocalyptic number.

849897409 is the 29153-rd square number.

849897409 is the 14577-th centered octagonal number.

It is an amenable number.

849897409 is a deficient number, since it is larger than the sum of its proper divisors (29154).

849897409 is an frugal number, since it uses more digits than its factorization.

849897409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58306 (or 29153 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 58.

The cubic root of 849897409 is about 947.2301253797.

The spelling of 849897409 in words is "eight hundred forty-nine million, eight hundred ninety-seven thousand, four hundred nine".