819790040 has 32 divisors (see below), whose sum is σ = 1904031360. Its totient is φ = 317337600.

The previous prime is 819790003. The next prime is 819790057. The reversal of 819790040 is 40097918.

It is a junction number, because it is equal to n+sod(n) for n = 819789976 and 819790003.

It is a congruent number.

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, 329321 + ... + 331800.

It is an arithmetic number, because the mean of its divisors is an integer number (59500980).

Almost surely, 2^819790040 is an apocalyptic number.

It is an amenable number.

819790040 is an abundant number, since it is smaller than the sum of its proper divisors (1084241320).

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

819790040 is a wasteful number, since it uses less digits than its factorization.

819790040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661163 (or 661159 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 819790040 is about 28631.9758312276. The cubic root of 819790040 is about 935.9102691150.

The spelling of 819790040 in words is "eight hundred nineteen million, seven hundred ninety thousand, forty".