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499999 = 311272

499999 has 6 divisors (see below), whose sum is σ = 520224. Its totient is φ = 480060.

The previous prime is 499979. The next prime is 500009. The reversal of 499999 is 999994.

It can be divided in two parts, 499 and 999, that multiplied together give a triangular number (498501 = T998).

It is a trimorphic number since its cube, 124999250001499999, ends in 499999.

It is a de Polignac number, because none of the positive numbers 2k-499999 is a prime.

It is a Duffinian number.

499999 is a modest number, since divided by 999 gives 499 as remainder.

It is a plaindrome in base 5 and base 10.

It is a zygodrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (499969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3874 + ... + 4000.

It is an arithmetic number, because the mean of its divisors is an integer number (86704).

2499999 is an apocalyptic number.

499999 is a deficient number, since it is larger than the sum of its proper divisors (20225).

499999 is an equidigital number, since it uses as much as digits as its factorization.

499999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285 (or 158 counting only the distinct ones).

The product of its digits is 236196, while the sum is 49.

The square root of 499999 is about 707.1060740794. The cubic root of 499999 is about 79.3699996850.

The spelling of 499999 in words is "four hundred ninety-nine thousand, nine hundred ninety-nine".

Divisors: 1 31 127 3937 16129 499999