9979487794 has 4 divisors (see below), whose sum is σ = 14969231694. Its totient is φ = 4989743896.

The previous prime is 9979487789. The next prime is 9979487831. The reversal of 9979487794 is 4977849799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4977849799 = 13 ⋅382911523.

It can be written as a sum of positive squares in only one way, i.e., 9861483025 + 118004769 = 99305^2 + 10863^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2494871947 + ... + 2494871950.

Almost surely, 2^9979487794 is an apocalyptic number.

9979487794 is a deficient number, since it is larger than the sum of its proper divisors (4989743900).

9979487794 is a wasteful number, since it uses less digits than its factorization.

9979487794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4989743899.

The product of its digits is 288054144, while the sum is 73.

The square root of 9979487794 is about 99897.3863221656. The cubic root of 9979487794 is about 2152.9606080770.

The spelling of 9979487794 in words is "nine billion, nine hundred seventy-nine million, four hundred eighty-seven thousand, seven hundred ninety-four".