838416505 has 4 divisors (see below), whose sum is σ = 1006099812. Its totient is φ = 670733200.

The previous prime is 838416479. The next prime is 838416517. The reversal of 838416505 is 505614838.

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 211615209 + 626801296 = 14547^2 + 25036^2 .

It is not a de Polignac number, because 838416505 - 2⁵ = 838416473 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 83841646 + ... + 83841655.

It is an arithmetic number, because the mean of its divisors is an integer number (251524953).

Almost surely, 2^838416505 is an apocalyptic number.

It is an amenable number.

838416505 is a deficient number, since it is larger than the sum of its proper divisors (167683307).

838416505 is a wasteful number, since it uses less digits than its factorization.

838416505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167683306.

The product of its (nonzero) digits is 115200, while the sum is 40.

The square root of 838416505 is about 28955.4227218323. The cubic root of 838416505 is about 942.9455306694.

The spelling of 838416505 in words is "eight hundred thirty-eight million, four hundred sixteen thousand, five hundred five".