999127993 has 4 divisors (see below), whose sum is σ = 1005833700. Its totient is φ = 992422288.

The previous prime is 999127957. The next prime is 999128003. The reversal of 999127993 is 399721999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 399721999 = 10939 ⋅36541.

It can be written as a sum of positive squares in 2 ways, for example, as 255584169 + 743543824 = 15987^2 + 27268^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999127993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999127903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3352630 + ... + 3352927.

It is an arithmetic number, because the mean of its divisors is an integer number (251458425).

Almost surely, 2^999127993 is an apocalyptic number.

It is an amenable number.

999127993 is a deficient number, since it is larger than the sum of its proper divisors (6705707).

999127993 is a wasteful number, since it uses less digits than its factorization.

999127993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6705706.

The product of its digits is 2480058, while the sum is 58.

The square root of 999127993 is about 31608.9859533646. The cubic root of 999127993 is about 999.7092464706.

The spelling of 999127993 in words is "nine hundred ninety-nine million, one hundred twenty-seven thousand, nine hundred ninety-three".