847217449 has 9 divisors (see below), whose sum is σ = 917811063. Its totient is φ = 781697592.

The previous prime is 847217431. The next prime is 847217473. The reversal of 847217449 is 944712748.

The square root of 847217449 is 29107.

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

It can be written as a sum of positive squares in only one way, i.e., 125328025 + 721889424 = 11195^2 + 26868^2 .

It is not a de Polignac number, because 847217449 - 2¹¹ = 847215401 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 847217399 and 847217408.

It is not an unprimeable number, because it can be changed into a prime (847217419) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 377272 + ... + 379510.

It is an arithmetic number, because the mean of its divisors is an integer number (101979007).

Almost surely, 2^847217449 is an apocalyptic number.

847217449 is the 29107-th square number.

847217449 is the 14554-th centered octagonal number.

It is an amenable number.

847217449 is a deficient number, since it is larger than the sum of its proper divisors (70593614).

847217449 is an frugal number, since it uses more digits than its factorization.

847217449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4504 (or 2252 counting only the distinct ones).

The product of its digits is 451584, while the sum is 46.

The cubic root of 847217449 is about 946.2334514515.

Multiplying 847217449 by its product of digits (451584), we get a square (382589844489216 = 19559904²).

It can be divided in two parts, 8472 and 17449, that added together give a square (25921 = 161²).

The spelling of 847217449 in words is "eight hundred forty-seven million, two hundred seventeen thousand, four hundred forty-nine".