819440412 has 96 divisors (see below), whose sum is σ = 2292820992. Its totient is φ = 222706176.

The previous prime is 819440411. The next prime is 819440431. The reversal of 819440412 is 214044918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819440411) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 379528 + ... + 381680.

It is an arithmetic number, because the mean of its divisors is an integer number (23883552).

Almost surely, 2^819440412 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 819440412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1146410496).

819440412 is an abundant number, since it is smaller than the sum of its proper divisors (1473380580).

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

819440412 is a wasteful number, since it uses less digits than its factorization.

819440412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2387 (or 2385 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 819440412 is about 28625.8696287117. The cubic root of 819440412 is about 935.7771996912. Note that the first 3 decimals are identical.

The spelling of 819440412 in words is "eight hundred nineteen million, four hundred forty thousand, four hundred twelve".