999997999394 has 4 divisors (see below), whose sum is σ = 1499996999094. Its totient is φ = 499998999696.

The previous prime is 999997999379. The next prime is 999997999417. The reversal of 999997999394 is 493999799999.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 798744375625 + 201253623769 = 893725^2 + 448613^2 .

It is a junction number, because it is equal to n+sod(n) for n = 999997999297 and 999997999306.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249999499847 + ... + 249999499850.

Almost surely, 2^999997999394 is an apocalyptic number.

999997999394 is a deficient number, since it is larger than the sum of its proper divisors (499998999700).

999997999394 is a wasteful number, since it uses less digits than its factorization.

999997999394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499998999699.

The product of its digits is 32543321076, while the sum is 95.

The spelling of 999997999394 in words is "nine hundred ninety-nine billion, nine hundred ninety-seven million, nine hundred ninety-nine thousand, three hundred ninety-four".