784880449 has 4 divisors (see below), whose sum is σ = 784942036. Its totient is φ = 784818864.

The previous prime is 784880431. The next prime is 784880471. The reversal of 784880449 is 944088487.

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 2 ways, for example, as 316590849 + 468289600 = 17793^2 + 21640^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-784880449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 784880396 and 784880405.

It is not an unprimeable number, because it can be changed into a prime (784880479) 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, 3774 + ... + 39799.

It is an arithmetic number, because the mean of its divisors is an integer number (196235509).

Almost surely, 2^784880449 is an apocalyptic number.

It is an amenable number.

784880449 is a deficient number, since it is larger than the sum of its proper divisors (61587).

784880449 is a wasteful number, since it uses less digits than its factorization.

784880449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61586.

The product of its (nonzero) digits is 2064384, while the sum is 52.

The square root of 784880449 is about 28015.7178919263. The cubic root of 784880449 is about 922.4323039412.

The spelling of 784880449 in words is "seven hundred eighty-four million, eight hundred eighty thousand, four hundred forty-nine".