1999078794 has 12 divisors (see below), whose sum is σ = 4331337426. Its totient is φ = 666359592.

The previous prime is 1999078747. The next prime is 1999078801. The reversal of 1999078794 is 4978709991.

It can be written as a sum of positive squares in only one way, i.e., 1173953169 + 825125625 = 34263^2 + 28725^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55529949 + ... + 55529984.

Almost surely, 2^1999078794 is an apocalyptic number.

1999078794 is an abundant number, since it is smaller than the sum of its proper divisors (2332258632).

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

1999078794 is a wasteful number, since it uses less digits than its factorization.

1999078794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111059941 (or 111059938 counting only the distinct ones).

The product of its (nonzero) digits is 10287648, while the sum is 63.

The square root of 1999078794 is about 44711.0589675530. The cubic root of 1999078794 is about 1259.7275790490.

The spelling of 1999078794 in words is "one billion, nine hundred ninety-nine million, seventy-eight thousand, seven hundred ninety-four".