819841930 has 16 divisors (see below), whose sum is σ = 1515600360. Its totient is φ = 319073472.

The previous prime is 819841927. The next prime is 819841961. The reversal of 819841930 is 39148918.

It can be written as a sum of positive squares in 4 ways, for example, as 654899281 + 164942649 = 25591^2 + 12843^2 .

It is a super-2 number, since 2×819841930² = 1344281580372249800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1107525 + ... + 1108264.

Almost surely, 2^819841930 is an apocalyptic number.

819841930 is a deficient number, since it is larger than the sum of its proper divisors (695758430).

819841930 is a wasteful number, since it uses less digits than its factorization.

819841930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2215833.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 819841930 is about 28632.8819716074. The cubic root of 819841930 is about 935.9300153740.

The spelling of 819841930 in words is "eight hundred nineteen million, eight hundred forty-one thousand, nine hundred thirty".