819965838 has 16 divisors (see below), whose sum is σ = 1648994256. Its totient is φ = 271811520.

The previous prime is 819965837. The next prime is 819965897. The reversal of 819965838 is 838569918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819965833) 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 7 ways as a sum of consecutive naturals, for example, 376431 + ... + 378602.

It is an arithmetic number, because the mean of its divisors is an integer number (103062141).

Almost surely, 2^819965838 is an apocalyptic number.

819965838 is an abundant number, since it is smaller than the sum of its proper divisors (829028418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

819965838 is a wasteful number, since it uses less digits than its factorization.

819965838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755219.

The product of its digits is 3732480, while the sum is 57.

The square root of 819965838 is about 28635.0456259458. The cubic root of 819965838 is about 935.9771640458.

The spelling of 819965838 in words is "eight hundred nineteen million, nine hundred sixty-five thousand, eight hundred thirty-eight".