838520909 has 2 divisors, whose sum is σ = 838520910. Its totient is φ = 838520908.

The previous prime is 838520873. The next prime is 838520951. The reversal of 838520909 is 909025838.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 591559684 + 246961225 = 24322^2 + 15715^2 .

It is a cyclic number.

It is not a de Polignac number, because 838520909 - 2⁸ = 838520653 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 838520909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (838523909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419260454 + 419260455.

It is an arithmetic number, because the mean of its divisors is an integer number (419260455).

Almost surely, 2^838520909 is an apocalyptic number.

It is an amenable number.

838520909 is a deficient number, since it is larger than the sum of its proper divisors (1).

838520909 is an equidigital number, since it uses as much as digits as its factorization.

838520909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 838520909 is about 28957.2255059078. The cubic root of 838520909 is about 942.9846692115.

The spelling of 838520909 in words is "eight hundred thirty-eight million, five hundred twenty thousand, nine hundred nine".