856074449 has 4 divisors (see below), whose sum is σ = 858209700. Its totient is φ = 853939200.

The previous prime is 856074419. The next prime is 856074493. The reversal of 856074449 is 944470658.

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 849314449 + 6760000 = 29143^2 + 2600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856074449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856074409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1067024 + ... + 1067825.

It is an arithmetic number, because the mean of its divisors is an integer number (214552425).

Almost surely, 2^856074449 is an apocalyptic number.

It is an amenable number.

856074449 is a deficient number, since it is larger than the sum of its proper divisors (2135251).

856074449 is a wasteful number, since it uses less digits than its factorization.

856074449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135250.

The product of its (nonzero) digits is 967680, while the sum is 47.

The square root of 856074449 is about 29258.7499562097. The cubic root of 856074449 is about 949.5194056672.

The spelling of 856074449 in words is "eight hundred fifty-six million, seventy-four thousand, four hundred forty-nine".