838559981 has 6 divisors (see below), whose sum is σ = 975467790. Its totient is φ = 718765656.

The previous prime is 838559959. The next prime is 838559987. The reversal of 838559981 is 189955838.

It can be written as a sum of positive squares in only one way, i.e., 772284100 + 66275881 = 27790^2 + 8141^2 .

It is not a de Polignac number, because 838559981 - 2¹⁴ = 838543597 is a prime.

It is a super-2 number, since 2×838559981² = 1406365683469440722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (838559987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8556686 + ... + 8556783.

It is an arithmetic number, because the mean of its divisors is an integer number (162577965).

Almost surely, 2^838559981 is an apocalyptic number.

It is an amenable number.

838559981 is a deficient number, since it is larger than the sum of its proper divisors (136907809).

838559981 is a wasteful number, since it uses less digits than its factorization.

838559981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17113483 (or 17113476 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 56.

The square root of 838559981 is about 28957.9001483188. The cubic root of 838559981 is about 942.9993155268. Note that the first 3 decimals are identical.

The spelling of 838559981 in words is "eight hundred thirty-eight million, five hundred fifty-nine thousand, nine hundred eighty-one".