999999997 has 8 divisors (see below), whose sum is σ = 1014697152.
Its totient is φ = 985320000.
The previous prime is 999999937. The next prime is 1000000007. The reversal of 999999997 is 799999999.
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 999999997 - 215 = 999967229 is a prime.
It is a Duffinian number.
It is a nialpdrome in base 10.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (999999937) 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, 156693 + ... + 162949.
It is an arithmetic number, because the mean of its divisors is an integer number (126837144).
Almost surely, 2999999997 is an apocalyptic number.
It is an amenable number.
999999997 is a deficient number, since it is larger than the sum of its proper divisors (14697155).
999999997 is a wasteful number, since it uses less digits than its factorization.
999999997 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 8579.
The product of its digits is 301327047, while the sum is 79.
The square root of 999999997 is about 31622.7765542496.
The cubic root of 999999997 is about 999.9999990000.
Note that the first 6 decimals are identical.
The spelling of 999999997 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-seven".