999117943 has 8 divisors (see below), whose sum is σ = 1024650000. Its totient is φ = 973690368.

The previous prime is 999117913. The next prime is 999117949. The reversal of 999117943 is 349711999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 999117943 - 2¹³ = 999109751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999117949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6568 + ... + 45181.

It is an arithmetic number, because the mean of its divisors is an integer number (128081250).

Almost surely, 2^999117943 is an apocalyptic number.

999117943 is a deficient number, since it is larger than the sum of its proper divisors (25532057).

999117943 is a wasteful number, since it uses less digits than its factorization.

999117943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52241.

The product of its digits is 551124, while the sum is 52.

The square root of 999117943 is about 31608.8269791842. The cubic root of 999117943 is about 999.7058945104.

The spelling of 999117943 in words is "nine hundred ninety-nine million, one hundred seventeen thousand, nine hundred forty-three".