6999720394 has 4 divisors (see below), whose sum is σ = 10499580594. Its totient is φ = 3499860196.

The previous prime is 6999720383. The next prime is 6999720419. The reversal of 6999720394 is 4930279996.

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., 5593095369 + 1406625025 = 74787^2 + 37505^2 .

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1749930097 + ... + 1749930100.

Almost surely, 2^6999720394 is an apocalyptic number.

6999720394 is a deficient number, since it is larger than the sum of its proper divisors (3499860200).

6999720394 is a wasteful number, since it uses less digits than its factorization.

6999720394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3499860199.

The product of its (nonzero) digits is 6613488, while the sum is 58.

The square root of 6999720394 is about 83664.3316712684. The cubic root of 6999720394 is about 1912.9057125744.

The spelling of 6999720394 in words is "six billion, nine hundred ninety-nine million, seven hundred twenty thousand, three hundred ninety-four".