784824421 has 2 divisors, whose sum is σ = 784824422. Its totient is φ = 784824420.

The previous prime is 784824413. The next prime is 784824487. The reversal of 784824421 is 124428487.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 708890625 + 75933796 = 26625^2 + 8714^2 .

It is an emirp because it is prime and its reverse (124428487) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 784824421 - 2³ = 784824413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (784824721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 392412210 + 392412211.

It is an arithmetic number, because the mean of its divisors is an integer number (392412211).

Almost surely, 2^784824421 is an apocalyptic number.

It is an amenable number.

784824421 is a deficient number, since it is larger than the sum of its proper divisors (1).

784824421 is an equidigital number, since it uses as much as digits as its factorization.

784824421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 114688, while the sum is 40.

The square root of 784824421 is about 28014.7179353996. The cubic root of 784824421 is about 922.4103544129.

The spelling of 784824421 in words is "seven hundred eighty-four million, eight hundred twenty-four thousand, four hundred twenty-one".