784948909 has 2 divisors, whose sum is σ = 784948910. Its totient is φ = 784948908.

The previous prime is 784948903. The next prime is 784948937. The reversal of 784948909 is 909849487.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 589032900 + 195916009 = 24270^2 + 13997^2 .

It is a cyclic number.

It is not a de Polignac number, because 784948909 - 2⁵ = 784948877 is a prime.

It is a super-2 number, since 2×784948909² = 1232289579480580562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (784948903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 392474454 + 392474455.

It is an arithmetic number, because the mean of its divisors is an integer number (392474455).

Almost surely, 2^784948909 is an apocalyptic number.

It is an amenable number.

784948909 is a deficient number, since it is larger than the sum of its proper divisors (1).

784948909 is an equidigital number, since it uses as much as digits as its factorization.

784948909 is an evil number, because the sum of its binary digits is even.

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

The square root of 784948909 is about 28016.9396794154. The cubic root of 784948909 is about 922.4591224117.

The spelling of 784948909 in words is "seven hundred eighty-four million, nine hundred forty-eight thousand, nine hundred nine".