499999999 has 4 divisors (see below), whose sum is σ = 500724280.
Its totient is φ = 499275720.
The previous prime is 499999993. The next prime is 500000003. The reversal of 499999999 is 999999994.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is a trimorphic number since its cube, 124999999250000001499999999, ends in 499999999.
It is not a de Polignac number, because 499999999 - 215 = 499967231 is a prime.
It is a Duffinian number.
499999999 is a modest number, since divided by 99999 gives 4999 as remainder.
It is a plaindrome in base 10.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (499999993) 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, 361104 + ... + 362485.
It is an arithmetic number, because the mean of its divisors is an integer number (125181070).
Almost surely, 2499999999 is an apocalyptic number.
499999999 is a deficient number, since it is larger than the sum of its proper divisors (724281).
499999999 is an equidigital number, since it uses as much as digits as its factorization.
499999999 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 724280.
The product of its digits is 172186884, while the sum is 76.
The square root of 499999999 is about 22360.6797526372.
The cubic root of 499999999 is about 793.7005254550.
The spelling of 499999999 in words is "four hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".