999747999 has 6 divisors (see below), whose sum is σ = 1444080456. Its totient is φ = 666498660.

The previous prime is 999747989. The next prime is 999748007.

999747999 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 999747999 - 2⁵ = 999747967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999747989) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55541547 + ... + 55541564.

It is an arithmetic number, because the mean of its divisors is an integer number (240680076).

Almost surely, 2^999747999 is an apocalyptic number.

999747999 is a deficient number, since it is larger than the sum of its proper divisors (444332457).

999747999 is a wasteful number, since it uses less digits than its factorization.

999747999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111083117 (or 111083114 counting only the distinct ones).

The product of its digits is 104162436, while the sum is 72.

The square root of 999747999 is about 31618.7918649654. The cubic root of 999747999 is about 999.9159926096.

The spelling of 999747999 in words is "nine hundred ninety-nine million, seven hundred forty-seven thousand, nine hundred ninety-nine".